Maitra B, Dandapat S, Chintakayala P. Differences between the perceptions of captive and choice riders toward bus service attributes and the need for segmentation of bus services in urban India. J Urban Plan Dev. 2015 Jun;141(2).
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Chintakayala PK, Maitra B. Modeling generalized cost of travel and its application for improvement of taxies in Kolkata. J Urban Plan Dev. 2010 Mar;136(1).