S. Shepherd, P. Pfaffenbichler:
"Sustainable transport policies under scarcity of oil supply";
Proceedings of ICE, Engineering Sustainability, 159 (2006), 2; 63 - 70.
http://www.extenza-eps.com/doi/pdf/10.1680/ensu.2006.159.2.63
Project Head Günter Emberger:
STEPS