@inproceedings{sgem2017S04069,
  title = {MODELING OF OPTIMAL STRUCTURE OF THE PASSENGERS TRANSPORT IN BULGARIA},
  author = {R. Nikolaev and T. Milkova and D. Zhelyazkova},
  booktitle = {4th International Multidisciplinary Scientific Conference on Social Sciences and Arts SGEM 2017},
  year = {2017},
  pages = {525-532},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgemsocial2017/14/S04.069}
}