By Cheung L.F.   Law C.K.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|289|1|1-13

Elsevier‎(2004)‎

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By Cheung L-F.   Leung P-F.   in Geometriae Dedicata

ISSN:0046-5755|72|1|15-17

Springer Publishing Company ‎(1998)‎

Access to resources Favorite 4.5690155