00457naa a2200157 a 450000100080000000500110000800800410001910000180006024500930007826000090017165000130018065000130019365000180020665300170022477300580024118035392017-04-17       1979    bl ---       0--  u    #d1 aGRILICHES, Z.  aIssues in assessing the contribution of research and development to productivity growth.  c1979  aresearch  aPesquisa  aProdutividade  aProductivity  tBell Journal of Economicsgv.10, n.1, p.92-116, 1979.