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1.

図書
図書
1. Operational research '81 : proceedings of the ninth IFORS International Conference on Operational Research, Hamburg, Germany, July 20-24, 1981 = Actes de la neuvième Conférence internationale de recherche opérationnelle, Hamburg, Germany, juillet 20-24, 1981
edited by J.P. Brans
出版情報: Amsterdam ; New York : North-Holland Pub. Co. , New York, N.Y. : Sole distributors for the U.S.A. and Canada, Elsevier North-Holland, c1981
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2.

図書
図書
2. Operational research '72 : proceedings of the 6th IFORS International Conference on Operational Research, Dublin, Ireland, August 21-25, 1972 = Operational research '72 : actes de la 6me IFORS Conférence internationale de recherche opérationnelle, Dublin, Irlande, 21-25 août, 1972 (: us ; : ne)
edited by Miceal Ross
出版情報: Amsterdam : North-Holland Pub. Co. , New York : American Elsevier Pub. Co., 1973
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