Benchohra, Mouffak, Lech Górniewicz, Sotiris K. Ntouyas, and Abdelghani Ouahab. 2003. “Impulsive Hyperbolic Differential Inclusions With Variable Times”. Topological Methods in Nonlinear Analysis 22 (2):319-29. https://apcz.umk.pl/TMNA/article/view/TMNA.2003.042.