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Mihai Rebenciuc and  Simona Mihaela Bibic,  Generalized Rough Sets Applied to Graphs Related to Urban Problems.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 406 - 411[viewed 23 June 2018]. Available from: http://waset.org/publications/10007960.