By Yasheng Y.   Xuecheng P.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|205|1|32-42

Academic Press‎(1997)‎

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By Yasheng Y.   Lijam N.   Sussman D.J.   Tsang M.   in Gene

ISSN:0378-1119|180|1|121-123

Elsevier‎(1996)‎

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