1. U.S. Department of Transportation;Bureau of Public Roads,1965
2. The value of land use activity categories in estimating non-residential trip generation;Dickey,1967
3. On grouping for maximum homogeneity;Fisher;J. Am. statist. Assoc.,1958
4. Examination and comparison of ADT gravity models;Horn,1966
5. Improvements in understanding, calibrating and applying the opportunity model;Ruiter;Highw. Res. Rec.,1967