1. 1) Mori, T. and Osawa, M. : Cities in a world of diminishing transport costs, arXiv, 2012.12503, 2020.
2. 2) Akamatsu, T., Mori, T., Osawa, M. and Takayama, Y. : Multimodal agglomeration in economic geography, arXiv, 1912.05113, 2021.
3. 3) Thisse, J.-F. and Ushchev, P. : Monopolistic competition without apology, in Corchón, L. C. and Marini, M. A. eds., Handbook of Game Theory and Industrial Organization: Vol. I, Edward Elgar, pp. 93-136, 2018.
4. 4) 国土交通省：国土のグランドデザイン 2050，2014. [Ministry of Land, Infrastructure, Transport and Tourism: Grand Design of National Spatial Development towards 2050, Japan, 2014]
5. 5) 大澤実, 赤松隆：集積経済理論の実証におけるモデル構造選択の課題, 土木学会論文集 D3 (土木計画学), Vol. 73, No. 1, pp. 1-15, 2017. [Osawa, M. and Akamatsu, T.: A critical note on recent empirical studies based on spatial agglomeration models, Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), Vol. 73, No. 1, pp. 1-15, 2017.]