1. Trip distribution using composite impedance;Allen W.;Transp. Res. Record,1983
2. The mathematical form of travel time factors;Ashford N.;Highway Res. Record,1969
3. Bajpai J. (1990). “Forecasting the basic inputs to transportation planning at the zonal level.” NCHRP Report 328 Transp. Res. Board Nat. Res. Council Washington D.C.
4. Barkley R. E. (1951). “Origin‐destination surveys and traffic volume studies.” Bibliography No. 11 Highway Res. Board 1–271.
5. Novel traffic survey method utilizes vehicle lights;Bebee M. A.;Highway Res. Board Bull.,1959