00253nam a2200109Ia 4500100002700000654001300027245002400040260004000064082001900104300000800123546001200131  aSasieni/ M./ Yaspan/A   aResearch  aOperations Research  bWiley InternationalaNew Yorkc1959  a658.4bSas/Yas  a316  aENGLISH