“…Since then, many researchers have worked on different aspects, in particular, in the realm of fixed point theory of partial metric spaces. For investigations in partial metric spaces, works of Valero and Oltra [9,15], Romaguera [16], Altun et al [6], Choudhury [2,3] are noteworthy. In this connection it should also be mentioned that before the introduction of partial metric spaces, there were other generalizations of metric spaces, most notably 2metric spaces and generalized metric spaces where fixed point theorems for contractive mappings had been investigated (see for example the work of Das et al [4,10] or Dey et al [17].…”