1. Sperling D (2004) Environmental impacts due to urban transport. Urban Transport and the Environment. An International Prospective, Elsevier, Oxford, pp. 99–189
2. Pérez PJ, Monzón A (2007) Mobility and environment in Spain. In: G Morrison, S Rauch (eds.) Highway and Urban Environment: Proceedings of 8th International Symposium on the Highway and Urban Environment, Springer Science, Dordrecht
3. OECD Environment Directorate (2003) Analysis of the links between transport and economic growth. Project on decoupling transport impacts and economic growth. Caid N. ENV/EPOC/WPNEP/T (2003) 4/FINAL, Paris, France, 94 pp
4. Pérez-Martínez PJ (2006) Mobility and environment in Spain. Are we tending towards sustainability? In: R. Joumard (ed.) Environment and Transport – Transport and Air Pollution, 2nd Conference, Reims, 12–14 June 2006, INRETS, Les Collections de LInrets, Bron Cedex, France, pp. 60–65
5. Lakshmanan TR, Xiaoli H (1997) Factors underlying transportation CO2 emissions in the U.S.A.: a decomposition analysis. Transportation Research D 2:1–15