Kristoffersson, Ida; Borjesson, Maria: 'The Swedish congestion charges – lessons learnt' (Transportation, 2018), 'Road Pricing: Technologies, economics and acceptability', Chap. 14, pp. 363-386, DOI: 10.1049/PBTR008E_ch14
IET Digital Library, https://digital-library.theiet.org/;jsessionid=a3hsx67mfgks.x-iet-live-01content/books/10.1049/pbtr008e_ch14