Beria, Paolo; Tosi, Luca; Nuccio, Davide: 'Four years of Milan's road charge: effectiveness, acceptability and impacts' (Transportation, 2018), 'Road Pricing: Technologies, economics and acceptability', Chap. 19, pp. 501-521, DOI: 10.1049/PBTR008E_ch19 IET Digital Library, https://digital-library.theiet.org/;jsessionid=aaa390i98fbbn.x-iet-live-01content/books/10.1049/pbtr008e_ch19