1. W. B. Bennett(1967 ). Cross-Section Studies of the Consumption of Automobiles in the United States ,American Economic Review, 1967 , pp.841 -850 .
2. G. C. Chow(1960 ). Statistical Demand Functions for Automobiles and Their Use for Forecasting, in Harberger, A. C .The Demand for Durable Goods.Chicago: 1960.