A Variance Formula for Marginal Productivity Estimates using the Cobb-Douglas Function H. O. Carter; H. O. Hartley Econometrica 1958 26(2), 306
Biometrika Tables for Statisticians, Volume I A. Hald; E. S. Pearson; H. O. Hartley Econometrica 1956 24(1), 99
Statistical Tables for Biological, Agricultural and Medical Research H. O. Hartley; Sir Ronald A. Fisher; F Yates Econometrica 1956 24(1), 90