00400    a2200133   4500001001000000005001700010008004100027245004400068100002800112700001700140700002300157773006900180999001700249ART_1386520260410161911.0260409a                                 10aRelative productivity levels, 1947-19731 aChristensen, Laurits R.1 aCummings, D.1 aJorgenson, Dale W.0 tEuropean economic reviewg- Vol. 16, Nº 1 (may. 1981)wREV13346  c26850d26850