Stone, John; Kirk, Yvonne: 'The 'disruption' we really need: public transport for the urban millennium' (Transportation, 2017), 'Low Carbon Mobility for Future Cities: Principles and applications', Chap. 7, pp. 139-162, DOI: 10.1049/PBTR006E_ch7
IET Digital Library, https://digital-library.theiet.org/;jsessionid=5enj3cqt0l71d.x-iet-live-01content/books/10.1049/pbtr006e_ch7