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I trasporti e l'industria
Ponti, Marco, (1992)
The transport market in the Czech Republic, the era of change, the new context, government action, the Czech Republic's contribution to the solution of international transport problems, foreign aid
Navratil, J., (1996)
EinÜberblick über Vollkosten und Gebühren für Verkehr in Europa
Quinet, Emile, (2003)