By Touati Y.   Amirat Y.   in International Journal of Computer Applications in Technology

ISSN:0952-8091|27|2-3|85-96

Inderscience Publishers‎(2006)‎

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By Amirat Y.   Nucci A.M.C.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|220|2|697-718

Academic Press‎(1998)‎

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