“…Various approaches are available in literature. For detailed survey one may refer to Khan and Ali [4], Nagaraja [9], Khan and Abu-Salih [5], Balasubramanian and Beg [12], Franco and Ruiz ( [13], [14]), Balasubramanian and Dey [11], López-Blázquez and Moreno-Rebello [6], Wesolowski and Ahsanullah [10], Dembińska and Wesolowski [1], Khan and Abouammoh [2], Athar et al [7], Khan and Athar [3] and references therein.…”