“…This notion has been considered by several authors (see [9]), who have notably generalized Banach's principle to obtain fixed point theorems, for example White [31], Iseki [14], Rhoades [28], Khan [16], Singh, Tiwari and Gupta [30], Naidu and Prasad [25], Naidu [26] and Zhang [18], Abd El-Monsef, Abu-Donia, Abd-Rabou [2], Ahmed [3] and others. The contractivity conditions used in these works are usually of the form d(F (x), F (y), a) ≤ .…”