The Approximate Determination of Indifference Surfaces by Means of Engel Curves A. Wald Econometrica 1940 8(2), 144
On the Statistical Treatment of Linear Stochastic Difference Equations H. B. Mann; A. Wald Econometrica 1943 11(3/4), 173
Theory of Games and Economic Behavior A. Wald; John V. Neumann; Oskar Morgenstern The Review of Economics and Statistics 1947 29(1), 47