The Joint Production Function of Starch Equivalent and Protein Equivalent in Feeding Dairy Cows John L. Dillon; Michael B. Jawetz Econometrica 1963 31(1/2), 285
Farm Size, Farming Intensity, and the Input-Output Relationship of Some Welsh and West of England Dairy Farms Orlin J. Scoville; Michael B. Jawetz Econometrica 1959 27(3), 523