@book{ BA14465516,
 author = "International Conference on Operational Research and Lawrence, Raymond John and International Federation of Operational Research Societies",
 title = "OR 69: proceedings of the fifth International Conference on Operational Research, Venice, 1969",
 publisher = "Tavistock Publications",
 year = "1970",
 URL = "https://ci.nii.ac.jp/ncid/BA14465516"
}
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