@InProceedings{Sobierajewicz:2019,
  author  = "P. Sobierajewicz and B. Wojtyszyn",
  title       = "The new era of sustainable cities in Eastern Europe development problems",
  booktitle   = "6th SWS International Scientific Conference on Social Sciences 2019; ISBN: 9786197408959",
  address     = "Albena, Bułgaria",
  publisher   = "Sofia, STEF92 Technology LTD.",
  volume      = "Conference Proceedings, Vol. 6, iss. 5",
  pages       = "399--406",
  year        = "2019",
}