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Charles Yneu Yang, An International Comparison of Consumption Functions, The Review of Economics and Statistics, Vol. 46, No. 3 (Aug., 1964), pp. 279-286 ...
Robert A. Pollak, Conditional Demand Functions and Consumption Theory, The Quarterly Journal of Economics, Vol. 83, No. 1 (Feb., 1969), pp. 60-78 ...