BLUM, F. Spatial distribution of mass transit funds in the Chicago metropolitan area. Bollettino della Società Geografica Italiana, [S. l.], p. 53–59, 1986. DOI: 10.36253/bsgi-6434. Disponível em: https://bsgi.it/index.php/bsgi/article/view/6434. Acesso em: 16 oct. 2026.