Some fixed point theorems in \(D\)-metric spaces (Q1887388)

The authors discuss some fixed point theorems in \(D\)-metric spaces, using expansion mappings. In corollary 3.10 the authors should mention the Kannan type metric [Bull. Calcutta Math. Soc. 60, 71--76 (1968; Zbl 0209.27104)]. Also in remark 3.11 they should mention the Chatterjea type metric [C. R. Acad. Bulg. Sci. 25, 727--730 (1972; Zbl 0274.54033); also Research Report No.~2 (1971), Centre of Adv. Studies in Appl. Math. Calcutta University, p. 12] and the Hardy-Rogers type metric [Can. Math. Bull. 16, 201--206 (1973; Zbl 0266.54015)].