**PAPERS**

**1. On the S. N. Bernstein
polynomials. The operator spectrum. (Romanian) Gaz. Mat., seria A,
vol.71, nr.12, 448-451, 1966.**

**1. On the S. N. Bernstein
polynomials. The operator spectrum. (English translation, 2013) Gaz. Mat., seria A,
vol.71, nr.12, 448-451, 1966.**

**2. Remarks on triples in
enriched categories. (in collaboration with H. Wiesler) Bull. Australl.
Math. Soc., vol.13, nr.3, 375-383, 1970.**

**3. A variety of associative structures with
one-sided zero elements in autonomous categories. Rev. Roum. Math. Pures et
Appl., tome 17, 1317-1322, 1972.**

**4. Conjugation relations in gamma-categories.
Studia Univ. Babeş-Bolyai, Series Math.-Mech., fasc.2, 5-10, 1974.**

**5. Categories whose objects
are determined by their rings of endomorphisms. Bull. Australl. Math. Soc.,
vol.15, nr.1, 65-72, 1976.**

**6. On an enriched theory of modules I.
Studia Univ. Babeş-Bolyai, Math., fasc.3, nr.2, 25-38, 1979.**

**7. On an enriched theory of modules II.
Studia Univ. Babeş-Bolyai, Math., fasc.3, nr.2, 3-17, 1980.**

**8. Some remarks about
mutual pseudocomplements in lattices. Mathematica, vol.22(45), nr.2,
237-239, 1980.**

**9. Note on B-high subgroups of abelian groups.
Mathematica, vol.23(46), nr.1, 9-10, 1981.**

**10. Torsion in lattices. Mathematica,
vol.25(48), nr.2, 127-129, 1983.**

**11. Restricted socle
conditions in lattices. Mathematica, vol.28(51), nr.1, 27-30, 1986.**

**12. Abelian groups with
pseudocomplemented lattice of subgroups. Studia Univ. Babeş-Bolyai,
Math., vol.31, fasc.3, 39-41, 1986.**

**13. Abelian groups with
continuous lattice of subgroups. (in collaboration with K. Benabdallah)
Studia Univ. Babeş-Bolyai, Math., vol.32, fasc.1, 31-32, 1987.**

**14. Cocompact elements in algebraic lattices.
Seminar of Algebra, 41-46, Univ. ''Babeş-Bolyai'', **

**15. Cocompact elements in algebraic lattices.
Proceedings of the **

**16. Torsion-free components in non-splitting
mixed abelian groups. Preprint nr.2, Univ. Babeş-Bolyai, **

**17. Socle and radical as pure subgroups of an
abelian group. Mathematica, vol.33(56), nr.1-2, 17-20, 1991.**

**18. Torsion-free components and topology.
Proceedings on the Conference on Algebra (**

**19. La T-topologie d'un groupe abelien. Studia
Universitatis Babeş Bolyai, Mathematica, XL, 4, 3-12, 1995.**

**20. Note on a module-theoretic exercise.
Mathematica 37(60), nr.1-2, 57-59, 1995.**

**21. Correction: La T-topologie d'un groupe
abelien. 1996, Studia Universitatis Babeş-Bolyai, Mathematica, XLI, 3,
107-108.**

**22. Cocompact lattices.
Mathematica Panonica, vol.7, nr.2, 185-190, 1996.**

**23. Distributively
generated lattices. Analele Ştiinţifice ale
Universităţii ''Al. I. Cuza'' din **

**24. Pure subgroups of mixed abelian groups
including the torsion part. Mathematica vol.39(62), nr.1, 29-35, 1997.**

**25. Essential-pure subgroups of abelian groups.
Mathematica, vol.39(62), nr.2, 195-200, 1997.**

**26. Coatomic lattices and
abelian group topics. Libertas Mathematica, XVII, 125-131, 1997.**

**27. On a problem of Prof.
A. Orsatti. Abelian groups, Module Theory, and Topology (Proceedings in
honor of Adalberto Orsatti 60-th birthday, Padova june 1997). Lecture Notes in
Pure and Applied Math., vol.201, 105-112, Marcel Dekker, 1998.**

**28. Purity in Gamma - lattices. Mathematica,
vol. 40(63), nr.2, 155-158, 1998.**

**29. Torsion in Gamma - lattices. Studia
Universitatis Babeş-Bolyai, Mathematica, XLIII, 1, 1-5, 1998.**

**30. Purity in ideal
lattices. Analele Ştiinţifice ale Universităţii ''Al.
I. Cuza'' din Iaşi, XLV, s.I.a., fasc. 1, 39-44, 1999.**

**31. A useful category for
mixed abelian groups, Theory and Applications of Categories, vol. 5, no. 4,
81-90, 1999.**

**32. Hypergroups associated
to lattices. (in collaboration with V. Leoreanu) Italian Journal of Pure
and Applied Mathematics, No.9, 165-173, 2001.**

**33. The
fully-invariant-extension property for abelian groups. (in collaboration
with G. Birkenmeier, L. Fuchs and P. Goeters) Communications in Algebra, 29,
673-685, 2001.**

**34. Abelian groups with
semi-local rings of endomorphisms. Communications in Algebra, 30 (9),
4105-4111, 2002.**

**35. Abelian groups
have/are near Frattini subgroups. (in collaboration with S.
Breaz) Commentationes Mathematicae Universitatis Carolinae ,
43, 3, 2002, 395-405.**

**36. Fully-invariant elements
in lattices. Mathematica, Tome 45(68), No. 1, 19 - 24, 2003.**

**37. Breaking points in subgroup
lattices. (in collaboration with M. Deaconescu) Proceedings, Groups St
Andrews 2001 in Oxford
(Volume 1), p. 59 - 62, **

**38. Distributivity and
IM-lattices. (in collaboration with R. Khazal) Italian Journal of Pure and
Applied Mathematics, vol.15, 175-184, 2004.**

**39. The total number of
subgroups of a finite Abelian group. Scientiae Mathematicae Japonicae, 60,
No. 1, 157 – 167, 2004.**

**39. The total number of
subgroups of a finite Abelian group.[2011 expanded and corrected version]**

**40. Abelian groups whose
subgroup lattice is the union of two intervals. (in collaboration with S. Breaz) Journal of the Australian Mathematical Society
78, 27-36, 2005.**

**41. On torsion-free periodic
rings. (in collaboration with S. Breaz and
R. Khazal) Int. J. Math. Sci., vol. 2005, no. 14, 2321 – 2327, 2005.**

**42. Abelian groups determined
by subgroup lattices of direct powers, Archiv der Math., vol. 86, no. 2
(2006), 97 - 100.**

**43. Self-c-injective Abelian
groups. (in collaboration with S. Breaz)
Rend. Sem. Mat. Padova, vol.116 (2006), 193-204.**

**44. Every Abelian group
is determined by a subgroup lattice, (in collaboration with S. Breaz) Studia Scientiarum Mathematicarum Hungaricae 45
(1) (2008), 135 - 137.**

**45. A solution to a
problem on lattice isomorphic Abelian groups, (in collaboration with K.M. Rangaswamy) Models, Modules and Abelian Groups, In
Memory of A.L.S. Corner, de Gruyter (nov 2008), p.249-256 .**

**46. Endomorphisms
and automorphisms of squares of abelian groups, (in collaboration with P. Schultz) Models, Modules and Abelian Groups, In Memory
of A.L.S. Corner, de Gruyter (nov 2008), p.121-134 .**

**47. Split-extensions
of Exchange Rings: a direct proof, Journal of Algebra and Applications,
vol. 8, No. 5 (2009), 629 - 632.**

**47'. Split-extensions
of Exchange Rings: a direct proof.[2017 simplified version]**

**48. Rings with lattices
of idempotents, Communications in Algebra, vol. 38, Issue 3 (2010), 1050 - 1056.**

**49. Morphic Abelian
Groups, Journal of Algebra and Applications, vol. 9, no. 2 (2010), 185 - 193.**

**50. One-sided clean
rings, Studia Universitatis Babes-Bolyai, vol. 55, No. 3 (2010), 83 - 92.**

**51. Modules with Abelian endomorphism
rings, (in collaboration with P. Schultz) Bull. Austral. Math. Soc., 82, part 1 (2010), 99-112.**

**52. Modules with Dedekind finite endomorphism
rings, (in collaboration with S. Breaz and P. Schultz) Mathematica, vol. 53 (76), No. 1 (2011), 15 - 28.**

**53. Realization theorems for triangular
rings, Scientific Annals of "Al.I. Cuza" University of Iasi, vol. 57, 2 (2011), 223 - 228.**

**54. On type 1 representable lattices of dimension less or equal
than 4, (in collaboration with C. Contiu) Algebra Universalis, vol. 67, 2 (2012), 131-139.**

**55. On Abelian groups with commutative clean endomorphism rings
, Scientific Annals of "Al.I. Cuza" University, vol. 58, 2 (2012), 227 - 238.**

**56. Morphic objects in categories
, (in collaboration with L. Pop) Bull. Math. Soc. Sci. Math. Roumanie, Tome 56(104), 2 (2013), 173-180.
**

**57. Between morphic and Hopfian
, (in collaboration with L. Pop) Anal. St. Univ. Ovidius Cta., Series Math. vol. 21, 3 (2013), 51-66.
**

**58. Subgroups which admit extensions of homomorphisms
, (in collaboration with S. Breaz and P. Schultz) published online December 9, 2013 in Forum Mathematicum; in print vol. 27 (5) (2015), 2533-2549.
**

**59. Nil-clean matrix rings
, (in collaboration with S. Breaz, P. Danchev and T. Micu) Linear Algebra and Applications vol. 439, 10 (2013), 3115-3119.
**

**60. Erratum to "On type 1 representable lattices of
dimension at most 4"
, (in collaboration with C. Contiu) Algebra Universalis, vol. 71, 1 (2014), 69-70.
**

**61. A nil-clean 2 x 2 matrix over integers which is not clean
, (in collaboration with D. Andrica) Journal of Algebra and its Applications, vol. 13, 6 (2014), 9 pages.
**

**61'. Example revisited
, 2015.
**

**62. Strongly invariant subgroups
, Glasgow Mathematical Journal, vol. 57, 2 (2015), 431-443.
**

**63. UU rings
, Carpathian Journal of Mathematics, vol. 31, 2 (2015), 157-163.
**

**64. Fine rings: A new class of simple rings
, (in collaboration with T. Y. Lam) J. of Algebra and its Appl., vol. 15, 9 (2016), 18 pages.
**

**65. UN rings
, J. of Algebra and its Appl., vol. 15, 10 (2016), 9 pages.
**

**66. Some matrix completions over integral domains
, Linear Algebra and its Applications, vol.507 (2016), 414-419.
**

**66'. Some matrix completions over integral domains, Corrections and addendum
, 3 pages.
**

**67. Sums of nilpotent matrices
, (in collaboration with S. Breaz) Linear and Multilinear Algebra, vol. 65, 1 (2017), 67-78.
**

**68. Uniquely clean 2 x 2 invertible integral matrices
, (in collaboration with D. Andrica) Studia Universitatis Babeş-Bolyai vol. 62 (3)(2017), 287-293.
**

**69. Strongly inert subgroups of Abelian groups
, (in collaboration with S. Breaz) Rend. Sem. Mat. Univ. Padova vol. 138 (2018), 101-114.
**

**70. A new class of semiprime rings
, Houston Journal of Mathematics vol. 44, no. 1 (2018), 21-30.
**

**71. Rings with very few nilpotents
, Scientific Annals of "Al.I. Cuza" University vol. 64 (1) (2018), 145-150.
**

**71'. Correction to "Rings with very few nilpotents"
**

**72. Tripotents: a class of strongly clean
elements in rings, Anal. St. Univ. Ovidius Cta., Series Math. vol. 26 (1) (2018), 69-80.
**

**73. Abelian groups with left morphic endomorphism ring
, J. of Algebra and its Appl. (vol. 17, no. 9, 2018), 8 pages.
**

**74. Clean integral 2x2 matrices
, Studia Sci. Math. Hungarica (vol. 55, no.1, 2018), 41-52.
**

**75. Subgroups generated by images of
endomorphisms of Abelian groups and duality
, (in collaboration with A. R. Chekhlov, P. A. Krylov) J. of Group Theory, (vol. 21, 2018), 885–900 [online 06/06/2018].
**

**76. Rings whose units commute
with nilpotent elements
, Mathematica vol. 60 (83), no.2, (2018), 119-126.
**

**77. A new class of nil-clean
elements which are exchange
, Beitrage zu Alg. und Geom. 60 (2019), 683-691.
**

**78. Idempotent matrices with invertible transpose
, Georgian Math. J. online June 13, 2019; Vol. 2,Issue 3 (2020), 351-353.
**

**79. Nil-clean integral 2x2 matrices: The elliptic case
, Bull. Math. Soc. Sci. Roum. (vol. 62 (110) no.3, 2019), 239-250.
**

**80. Strictly invariant submodules,
(in collaboration with S. Breaz and A.R. Cheklov), Mediterranean J. of Math. vol.16, no. 4, 2019, 14 pages.
**

**81. Uniquely fine 2x2 integral matrices
, Journal of Algebra, Number Theory: Advances and Applications, vol.20, 1, (2019), 83-99.
**

**82. Matrices that are similar to their inverses
, The Mathematical Gazette, vol. 104, Issue 559, (2020), 116-124.
**

**83. Unit exchange elements in rings
, Studia Universitatis Babeş-Bolyai, 65, No. 3 (2020), 333-344.
**

**83. Jacobson’s Lemma fails for nil-clean 2 × 2
integral matrices
, (in collaboration with Horia F. Pop) Anal. St. Univ. Ovidius Cta., Series Math., vol. XXVIII, fasc. 3, (2020), 83-88.
**

**84. The nil-clean 2 × 2 integral units.
, Hacettepe Journal of Mathematics and Statistics, (Early Access, October 2020), vol. 50, (1), (2021), 41-45.
**

**85. Are nil-clean 3 × 3 integral matrices, exchange?
, (in collaboration with Horia F. Pop) Scientific Annals of "Al.I. Cuza" University, vol. 67, (2), (2021), 171-186.
**

**86. Trace 1, 2 × 2 matrices over principal ideal
domains are exchange
, (in collaboration with Horia F. Pop) Carpathian Math. J. vol. 36, No. 3, (2020), 393-401.
**

**87. Solitary subgroups of Abelian groups
, (in collaboration with Andrey Cheklov) Expositiones Math. Volume 39, Issue 3, September 2021, Pages 354-368 [Available online 22 October 2020].
**

**88. Rings with fine idempotents
, (in collaboration with Yiqiang Zhou) J. of Alg. and Appl. vol.21, No. 1, (2022) 14 pages [Online ready, October 20, 2020].
**

**89. On unit fine rings
, Mediterranean J. of Math. 18, Article number: 115 (20 April) 2021.
**

**90. Abelian groups with left comorphic endomorphism rings
, (in collaboration with Andrey Cheklov) Internat. Electronic J. of Algebra vol. 30 (2021), 217-230.
**

**91. On zero determinant matrices that are full
, (in collaboration with Horia F. Pop) Mathematica Panonica, vol. 27 issue 2, 81-88, 2021.
**

**92. Rings with fine nilpotents
, (in collaboration with Yiqiang Zhou) Annali del Univ. Ferrara; vol. 67, issue 2, 231 - 241, 2021.
**

**92'. Erratum to "Rings with fine nilpotents"
, 2021.
**

**92''. Rings with fine nilpotents, Corrected version (February 2022)
, (in collaboration with Yiqiang Zhou) Annali del Univ. Ferrara; vol. 67, issue 2, 231 - 241, 2021.
**

**93. Singular matrices that are products of two
idempotents or products of two nilpotents
, Special Matrices, vol. 10, issue 1, 47-52, 2022.
**

**94. Negative clean rings
, (in collaboration with Horia F. Pop) Anal. St. Univ. Ovidius
Cta., Series Math., vol. 30, fasc. 2, 63-89, 2022.
**

**95. 3 × 3 idempotent matrices over some domains
and a conjecture on nil-clean matrices, Scientific Annals of "Al.I. Cuza" University, vol. 68, f.1, 91-16, 2022.
**

**96. Utumi Abelian groups
, (in collaboration with S. Das) Rendiconti Sem. Mat. Univ. Padova, online first, February 4, 2023.
**

**97. On stable range one matrices
, (in collaboration with H. Pop) Bull. Math. Soc. Sci. Math. Roumanie
Tome 65 (113), No. 3, 2022, 317–327.
**

**97'. Erratum to "On stable range one matrices"
, 2024.
**

**98. On idempotent stable range one matrices
, (in collaboration with H. Pop) Special matrices, vol. 10, issue 1, 251-257, 2022.
**

**99. Rings whose clean elements are uniquely clean
, (in collaboration with Y. Zhou) Mediterranean J. of Math., vol. 20, issue 1, 15, 2023.
**

**100. Unipotent diagonalization of matrices
, Intern. Electr. J. of Algebra, online April 14, 2023; vol. 34, 71-87.
**

**101. Unit stable range one matrices
, online 24 March, Annali dell Universita di Ferrara, 2023, 14 pages.
**

**102. Abelian groups with C2
, (in collaboration with P. Keef) online first, December 2023; J. of Alg. and Appl. Volume 23, Issue 08 (July 2024), 9 pages.
**

**103. Dependent rings
, online 29 May, Rend. Circolo Mat. Palermo, series 2, 2023, 13 pages.
**

**104. Similarity for 2 × 2 matrices obtained by clockwise ”rotation”
, Math. Panonica, Vol. 29, No. 2, 2023, 195-203.
**

**105. Replacing units by unipotents
, Carpathian J. Math., Vol. 40, No. 1, 2024, 27-38.
**

**106. Unipotent similarity for matrices over commutative domains
, to appear in Acta Univ. Sapientiae 2024.
**

**107. 2-products of idempotent by nilpotent matrices
, (in collaboration with H. F. Pop) Bull. Iranian Math. Soc. online 31 July 2024.
**

**107'. Correction to "2-products of idempotent by nilpotent matrices"
, (in collaboration with H. F. Pop) Bull. Iranian Math. Soc.
**

**108. Idempotents which are products of two nilpotents
, (in collaboration with H. F. Pop) Special Matrices vol. 12, (1), 2024.
**

**109. The formula ABA=Tr(AB)A for matrices
, Beitraege fur Algebra und Geometrie, vol. 65, Issue 2, June 2024.
**

**110. The X-semiprimeness of rings
, (in collaboration with T. K. Lee and J. Matczuk) to appear in J of Algebra and its Appl., 2026.
**

**111. On the equation a˛x=a in unital rings
, (in collaboration with Horia F. Pop) to appear in International Electronic J of Algebra, 2024.
**