1. 1) Mun S. I. : Transport network and system of cities, Journal of Urban Economic, pp. 205-221, 1997.
2. 4) Atsushi KOIKE, Keisuke SATO, Lori Tavasszy, Research reports ”Uddevalla Symposium 2008”, pp. 457-470, 2008.
3. 5) Harker, P. T. : Predicting Intercity Freight Flows, VNU Science Press BV, 1987.
4. 6) Christian G, A. Monfort, Q. Vuong, Statistics and Econometric Models, Cambridge University Press, P458, 1995