Model building in mathematical programming / H. Paul Williams. Williams, H. P. Programming (Mathematics) Mathematical models. T57.7 .W55 1999 519.7 21 WIM Includes bibliographical references and indexes. Chichester ; New York : Wiley, 1999. 1999. 1999 Text ix, 354 p. http://www.loc.gov/catdir/description/wiley0310/99032311.html http://www.loc.gov/catdir/toc/onix02/99032311.html eng