作者:DICKENS, WT; KATZ, LF; LANG, K; SUMMERS, LH
作者单位:National Bureau of Economic Research; Harvard University; Boston University
作者:ICHNIOWSKI, C; FREEMAN, RB; LAUER, H
作者单位:National Bureau of Economic Research; Harvard University
作者:ADDISON, JT; PORTUGAL, P
作者单位:Otto Friedrich University Bamberg; Universidade do Porto
作者:BARTEL, AP
作者单位:National Bureau of Economic Research