00297nam a2200109Ia 4500082002100000100001800021245008900039260003400128300001500162500000500177700000500182  a658.403bG481.ME  aGillis, F. E.  aManagerial economics; decision making under certainty for business and engineeringb  aReadingbAddison-Wesleyc1969  avii, 296p.  a  a