Biezus, L. and Rocha, AJO. (1999) Does congestion management improve public transit? Logos Engenharia.
Cairns, S., Hass-Klau, C. and Goodwin, P. (1998) Traffic of highway capacity reductions: assessment of the evidence. London, Landor Publishing.
Goddard, H. (1997) Using tradable permits to achieve sustainability in the world's large cities. Environmental and Resource Economics 10 63-99.
Hayes, S., Gascon, O., Crespo, J., Bonora, S. and Gazzotti, F. (1995) Generalised and advanced urban debiting innovations: The GAUDI Project 4. Vehicle access control tools for demand management. Traffic Engineering and Control 36(6) 362-368.
Miles, J., Walker, J., Macmillan, A. and Routledge, I. (1998) Access control in city centres: objectives, methods and examples. Traffic Engineering and Control 39(12) 648-654.
Ogunsanya, A.A. (1984) Improving urban traffic flow by restraint of traffic: The case of Lagos, Nigeria. Transportation 12(2) 183-194.
Topp, H. and Pharoah, T. (1994) Car-free city centers. Transportation 21(3) 231-247.
TRANSLAND (1999) Bologna, Italy: Restriction of automobile traffic in
the historical center.
Vera, P.E., Hayes, S. and Burgell, J. (1993) Findings from a GAUDI: Zone access control field-trial in Barcelona. Traffic Engineering and Control 34(3) 114-121.