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Journal of Mathematical Analysis and Applications > 2001 > 258 > 2 > 512-535
Computers and Mathematics with Applications > 1998 > 36 > 3 > 1-9
Journal of Mathematical Analysis and Applications > 2001 > 258 > 2 > 512-535
Computers and Mathematics with Applications > 1998 > 36 > 3 > 1-9