This paper has already been published in: Highways, Proceedings of Seminar K held at the PTRC European Transport Forum, University of Warwick, England, September 12-16 1994, Volume P382, p. 89-95. For the abstract see IRRD 869162.
In: Financing transport : proceedings of seminar L (P383) held at the 22th PTRC European Transport and Planning Summer Annual Meeting, University of Warwick, England, September 12-16, 1994, p. 97-103
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