London congestion charge (English Wikipedia)

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bbc.co.uk

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worldcat.org

Green, Colin P.; Heywood, John S.; Navarro Paniagua, Maria (1 September 2020). "Did the London congestion charge reduce pollution?" (PDF). Regional Science and Urban Economics. 84: 103573. doi:10.1016/j.regsciurbeco.2020.103573. ISSN 0166-0462. S2CID 169274952.