Convexity conditions in normed linear spaces.
On best simultaneous approximation.
Fixed points and coincidence points for multimaps with not necessarily bounded images.
Fixed Point Theorems for Pairs of Selfmaps on a Metric Space
On convergent sequences and fixed point theorems in -metric spaces.
On the concepts of balls in a -metric space.
On the topology of -metric spaces and generation of -metric spaces from metric spaces.
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