00334nam a2200109Ia 4500008004100000082001900041100002000060245005000080260003300130300002100163500004000184260206b        |||||||| |||| 00| 0 eng d  a519.7bW723.MB  aWilliams, H. P.  aModel building in mathematical programmingb/  aNew York:bJohn Wiley,c1978  axiv, 330p. Index  a"A wiley interscience publication".