1. Ciuffini, F.M. (1995), “Transport and public spaces: the connectivity tissue of the sustainable city”, in The Sustainable City, A European Tetralogy, European Foundation for the Improvement of Living and Working Conditions, Dublin.
2. ISOTOPE, “Improved structure and organisation for urban transport operation in Europe” (1997), Transport Research Fourth Framework Programme, Urban Transport, VII‐51, Office for Official Publications of the European Communities.
3. Maca´rio, R. and Viegas, J. (1999), “Regulating the performance of urban public transport systems in different regulatory settings”, Sixth International Conference on Competition and Ownership in Land Passenger Transport, Capetown.
4. Viegas, J. and Maca´rio, R. (1998), “Legal and regulatory options to promote system integration in Urban Public Transport”, 8th World Conference on Transport Research, UFSIA, Antwerp.