Kim, T. H., Park, J. J., Lee, K. Y. and Park, Y. D. (2009). “Analysis and estimation
                           of factors affecting travel time budget.” Korean Society of Road Engineers, Vol. 11,
                           No. 3, pp. 13-21 (in Korean).Kim, T. H., Park, J. J., Lee, K. Y. and Park, Y. D. (2009).
                           “Analysis and estimation of factors affecting travel time budget.” Korean Society
                           of Road Engineers, Vol. 11, No. 3, pp. 13-21 (in Korean).
