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Demonstratio Mathematica > 2020 > Vol. 53, nr 1 > 167--173
Demonstratio Mathematica > 2017 > Vol. 50, nr 1 > 309--319
Commentationes Mathematicae > 2013 > Vol 53, No. 1 > 47--59
Advances in Difference Equations > 2013 > 2013 > 1 > 1-11
Journal of Inequalities and Applications > 2013 > 2013 > 1 > 1-9
Czasopismo Techniczne. Nauki Podstawowe > 2013 > R. 110, z. 1-NP > 11--17
Demonstratio Mathematica > 2004 > Vol. 37, nr 4 > 871--882
Annales Societatis Mathematicae Polonae. Seria 00001: Commentationes... > 2003 > [Z] 43(2) > 201-206
Journal of Applied Analysis > 2002 > Vol. 8, nr 1 > 33-48
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1999 > 19 > 1-2 > 111-121
Applied Mathematics Letters > 1996 > 9 > 1 > 49-53