1. 1) Hörcher, D. and Tirachini, A.: A review of public transport economics, Economics of Transportation, Vol. 25, 100196, 2021.
2. 2) 村井藤紀，塩見康博：路線バス乗り放題社会実験に基づく学生の行動変容に関する研究，土木計画学研究・講演集，CD-ROM, Vol. 60, 2019. [Murai, F. and Shiomi, Y.: Study on travel behavior change of students based on social experiment that public transit bus can ride freely, Proceedings of Infrastructure Planning, CD-ROM, Vol. 60, 2019.]
3. 3) 村井藤紀，塩見康博：路線バスを対象としたサブスクリプション型運賃制度の採算性における導入可能性の検討，土木学会論文集 D3, Vol. 75, No. 5, pp. 1177-1187, 2019. [Murai, F. and Shiomi, Y.: A feasibility study on subscription bus service, Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), Vol. 75, Issue 5, pp. I_1177-I_1187, 2019.]
4. 4) 今釜卓哉，太田恒平，大屋誠，溝上章志：「熊本県内バス・電車無料の日」が交通とまちに与えた多面的効果，土木学会論文集 D3 （土木計画学），77 巻 1 号，pp. 21-31, 2021. [Imagama, T., Ota, K., Oya, M. and Mizokami, S.: Multi-faceted effects of “Kumamoto bus and train free day” social experiment on transit and central city area, Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), Vol. 77, Issue 1, pp. 21-31, 2021.]
5. 5) 吉田樹：乗合バス運賃の政策的割引に関する研究－青森県八戸圏域の実証分析－，土木学会論文集 D3 ,Vol. 78, No. 6, pp. II_449-II_459, 2022. [Yoshida, I.: Research on policy discounts for bus fares, Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), Vol. 78, No. 6, pp. II_449-II_459, 2022.]