Boundedness and stability in nonlinear delay difference equations employing fixed point theory. Islam, Muhammad; Yankson, Ernest — 2005 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Periodic solutions of neutral delay integral equations of advanced type. Islam, Muhammad N.; Sultana, Nasrin; Booth, James — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]