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In: Operational research, 72. Proc. 6th IFORS Internat. Conference on Operational Bes. Dublin, 1972. Amsterdam - London, North-Holland Publ. Company.
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In: Operational research, 72. Proc. 6th IFORS Internat. Conference on Operational Bes. Dublin, 1972. Amsterdam - London, North-Holland Publ. Company.
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