Travel, in the younger sort, is a part of education; in the elder,
a part of experience. (Francis Bacon)
2011 - present1996 - 2010
- February 2024, Danang University of Science and Education, Vietnam.
- May 2019, Technische Hochschule Mittelhessen, Germany.
- April 2018, Perm State University, Russia.
- October 2017, University of Technology and Economics, Budapest, Hungary.
- January – February 2016, Burapha University, Faculty of Engineering, Bangsaen, Thailand.
- May 2014, University of Murcia, Faculty of Mathematics, Spain.
- May 2013, University of Miskolc, Faculty of Mechanical Engineering and Informatics, Department of Analysis, Hungary.
- June 2012, University of Tallinn, Department of Mathematics, Estonia.
- May 2011, University of Lerida, Department of Mathematics, Spain.
- April 2010, Faculty of Arts and Science, Abant Izzet Baysal University of Bolu, Turkey.
- April – May 2002, Faculty of Sciences of the University of Bari, Italy.
- April 2000, Faculty of Sciences of the University of Bari, Italy.
- May – June 1996, Documentation stage at Interdisziplinäres Zentrum für Wissenschaftliches Rechnen, Heidelberg University, Germany.