D. I. De Souza and D. Kipper and G. P. Azevedo, Comparing the Quality of Service of Bus Companies Operating in two Cities in Brazil. journal = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2012, vol. 66(6). 1033 - 1037 [viewed 18 September 2024]. Available from: https://publications.waset.org/pdf/13927.