标题：On the concepts of balls in a <mml:math alttext="$D$" id="E1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>D</mml:mi></mml:math>-metric space
期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2005
卷号：2005
DOI：10.1155/IJMMS.2005.133
出版社：Hindawi Publishing Corporation
摘要：The various concepts of open balls in D-metric spaces are studied in the case of certain D-metric spaces and many results in the literature on such balls
are shown to be false.
