Каук, Виктор Иванович, and Александр Дубровский. “Methods for Building Geo-Social Systems in the Internet. Cartographic and Geo-Location Services”. Eastern-European Journal of Enterprise Technologies 3, no. 4(45) (May 28, 2010): 56–59. Accessed January 30, 2026. https://journals.uran.ua/eejet/article/view/2818.