Journal of Political Economy 1972 80(3, Part 2), S1-S1

Journal of Political Economy 1972 80(3, Part 2), S2-S30

Journal of Political Economy 1969

Journal of Political Economy 1968 76(3), 327-347

Journal of Political Economy 1962 70(5, Part 2), 1-8 open access

Journal of Political Economy 1960 68(6), 571-583

Journal of Political Economy 1950 58(1), 1-15

Journal of Political Economy 1948 56(2), 157-160

The Review of Economics and Statistics 1950 32(4), 356

Econometrica 1953 21(3), 497