1. Alexandersson, G.; Hultén, S.; Fölster, S. 1998. The effects of competition in Swedish local bus services, Journal of Transport Economics and Policy 32(2): 203-219. Available from Internet: https://www.jstor.org/stable/20053766
2. Alexandersson, G.; Pyddoke, R. 2004. Bus deregulation in Sweden revisited: experiences from 15 years of competitive tendering, in D. A. Hensher (Ed.). Competition and Ownership in Land Passenger Transport: Selected Papers from the 8th International Conference (THREDBO 8), 14-18 September 2003, Rio de Janeiro, Brazil, 1-14.
3. Augustin, K.; Walter, M. 2010. Operator changes through competitive tendering: empirical evidence from German local bus transport, Research in Transportation Economics 29(1): 36-44. https://doi.org/10.1016/j.retrec.2010.07.006
4. Banković, R. 1994. Organizacija i tehnologija javnog gradskog putničkog prevoza. Univerzitet u Beogradu, Republika Srbija. 294 s. (in Serbian)
5. Beck, A. 2011. Experiences with competitive tendering of bus services in Germany, Transport Reviews 31(3): 313-339. https://doi.org/10.1080/01441647.2010.511299