By Dourmas G.N.   Nikitakos N.V.   Lambrou M.A.   in International Journal of Business Information Systems

ISSN:1746-0972|4|1|1-24

Inderscience Publishers‎(2008)‎

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By Karayannakis D.   Lambrou M.S.   Horváth M.J.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|215|1|190-211

Academic Press‎(1997)‎

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