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[1] Amir Moghaddaas Eesfehani Cycle History 13. Proceedings, 13th International Cycling History Conference. San Francisco: 2003, pp. 94-102

[2] International union of railways 2003 statistics.

[3] International bicycle fund Compiled from various sources.

[4] Bicycle business magazine Original source: BikeEurope, February 2003

[5] World Bank Cities on the Move, chapter 2, page 7