Leontief System", 1958, Econometrica. "Some Properties of a Dynamic Leontief System with a Spectrum of Techniques", 1959, Econometrica. "Existence of Solution
Comparative Study of Alternative Estimators in a Distributed Lag Model," Econometrica, Vol. 35, No. 3/4 (Jul. - Oct., 1967), pp. 509-529, (with Wayne A. Fuller)