00331nam a2200121 a 450000500170000008200180001710000210003524500530005626000330010930000230014249000270016563000170019220251202164230.0  a330.1543bDOW  aDowling Edward T  aTheory and problems of mathematics for economics  aNew YorkbMmcGraw Hillc1980  a407 p.b26 cm.cPB  aSchaums Outline Series  aEconometrics