Tveit, Bjarne Olav: 'Moving from conventional tolling installations to open road tolling' (Transportation, 2018), 'Road Pricing: Technologies, economics and acceptability', Chap. 15, pp. 387-402, DOI: 10.1049/PBTR008E_ch15
IET Digital Library, https://digital-library.theiet.org/;jsessionid=32q4vvlplu99f.x-iet-live-01content/books/10.1049/pbtr008e_ch15