By Saxon S.A.   Tweddle I.   in Advances in Mathematics

ISSN:0001-8708|145|2|230-238

Academic Press‎(1999)‎

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By Saxon S.A.   Sanchez Ruiz L.M.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|203|3|677-685

Academic Press‎(1996)‎

Access to resources Favorite 11.535055