By Pop P.   in Annals of Operations Research

ISSN:0254-5330|150|1|193-204

Springer Publishing Company ‎(2007)‎

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By Matei O.   Pop P.   Vălean H.   in Applied Intelligence

ISSN:0924-669X|39|4|739-748

Springer Publishing Company ‎(2013)‎

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