A Survey of Modern Algebra Kenneth O. May; Garrett Birkhoff; Saunders MacLane Econometrica 1954 22(3), 391
Linear Aggregation of Economic Relevations. Contributions to Economic Analysis VII Kenneth O. May; Henri Theil Econometrica 1958 26(2), 337
Introduction to Finite Mathematics Kenneth O. May; John G. Kemeny; J. Laurie Snell; Gerald L. Thompson Econometrica 1959 27(2), 324