By Groenewald H.   in Transport Policy

ISSN:0967-070X|10|1|1-15

Elsevier‎(2003)‎

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By Chandra N   Groenewald H W   Kriel J N   Scholtz F G   Vaidya S   in Journal of Physics A: Mathematical and Theoretical

ISSN:1751-8121|47|44|445203-445234

IOP Publishing‎(2014)‎

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