Vermaat, Peter: 'Standardisation and implementation of ANPR – a practical guide' (Transportation, 2018), 'Road Pricing: Technologies, economics and acceptability', Chap. 11, pp. 285-310, DOI: 10.1049/PBTR008E_ch11 IET Digital Library, https://digital-library.theiet.org/;jsessionid=lje8wc9ko004.x-iet-live-01content/books/10.1049/pbtr008e_ch11