Hayward, Mike; Resch, Hubert: 'The European Electronic Toll Service – EETS – and the REETS project' (Transportation, 2018), 'Road Pricing: Technologies, economics and acceptability', Chap. 10, pp. 251-284, DOI: 10.1049/PBTR008E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=9dhgl5ea89eka.x-iet-live-01content/books/10.1049/pbtr008e_ch10