KITA, Hideyuki. A frame work for bus service studies. Proceedings of Infrastructure Planning. 2003, 27
TODOKORO, Takashi. Proposal of improving bus services between Maebashiand Takasaki. Studies of Regional Policy. 2001, 4, 1, 1-18
WAKANA, C. A study of municipally bus service-by the questionnaire to 212 cities, towns and villages, in Hokkaido prefecture. Proceedings of Infrastructure Planning. 2003, 27