000 00299nam a2200109 4500
245 _aEconomic and operational research
_cM. H. Beilby
100 _aBeilby, M.H
260 _aLondon
_bPitman
_c1975
300 _ax,174p.; 22cm
490 _aTopics in operational research series
082 _a658.4034
_bBEI
999 _c22052
_d22052