000 002690000a22001210004500
245 _aEconomics and operational research
100 _aBeilby, M.H.
260 _aLondon
_bPitman
_c1975
300 _a174 p.
080 _a65.012.122
_bB4
041 _aEN
942 _cBK
999 _c104227
_d104227