- Communications in Mathematical Analysis Volume 4, Number 1, pp. 19 (2008)
- Electronic Journal of Qualitative Theory of Differential Equations Spec. Ed. I, 2009 No. 1, 199; http://www.math.u-szeged.hu/ejqtde/
- Eighth Mississippi State -UAB Conference on Differential Equations and Computational Simulations. Electronic Journal of Differential Equations, Conf. 19 (2010), pp. 151159.
- Electronic Journal of Differential Equations, Vol. 2005(2005), No. 78, pp. 18. ISSN: 1072-6691. URL: http://ejde.math.txstate.edu or http://ejde.math.unt.edu
- Electronic Journal of Qualitative Theory of Differential Equations 2010, No. 53, 1-13; http://www.math.u-szeged.hu/ejqtde/
- Communications in Mathematical Analysis Volume 2, Number 1, pp. 1321, 2007
- PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
