By Bartušek M.   Cecchi M.   Došlá Z.   Marini M.   in Czechoslovak Mathematical Journal

ISSN:0011-4642|55|1|209-222

Springer Publishing Company ‎(2005)‎

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By Cecchi M.   Došlá Z.   Athanasson M.Z.S.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|231|2|509-525

Academic Press‎(1999)‎

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