00284nam a2200109Ia 4500082002000000100002100020245008000041260002600121300001700147500000500164700000500169  a658.57bM287.IR  aMansfield, Eiwin  aIndustrial research and technological innovation; an econometric analysisb  aLondonbLongmanc1968  axviii, 235p.  a  a