The criteria of ultimate boundedness for nonautonomous Lotka-Volterra tree systems. - Xue-Zhi Li; Geni Gupur; Xin-Hua Ji (Appl. Math. Lett., 2001)

Further Research on the M/G/1 Retrial Queueing Model with Server Breakdowns. - Ehmet Kasim; Geni Gupur (J. Appl. Math., 2012)