00659naa#a2200193#i#450# EN\\bibl\19890 20250218055559.2 1995-042X 20180126b2018####ek#y0engy0150####ca RUS RU ON THE ISSUE OF RUSSIAN TOURISM IN BULGARIA: GEOPOLITICAL, ECONOMIC AND LEGAL ASPECTS Journal article CHERKIZOVO Russian State University of Tourism and Service 2018 14 с. Journal article local Туристско-экскурсионное обслуживание. 71.37 grnti POPOVA Nikolina MUKOVA Lyudmila naukaru.ru