共 15 条
[1]
Ahmad B, 2012, Commun. Appl. Nonlinear Anal, V19, P59
[4]
Ahmad B, 2011, ELECTRON J DIFFER EQ
[7]
Bohner M., 2001, Dynamic Equations on Time Scales: An Introduction with Applications, DOI DOI 10.1007/978-1-4612-0201-1
[10]
El-Shahed M, 2010, P AM MATH SOC, V138, P1733