00325nam a2200133Ia 4500082001800000100001900018245005100037260001800088300001600106490001400122490003900136500000500175760001100180  a658.82 C728b  aComanor, W. S.  aAdvertising market structure and performanceb  aTorontoc1967  app. 423-440  vNov. 1967  aReview of Economics and Statistics  a  aIQUSEP