00497naa#a2200169#i#450# EN\\bibl\771 20240428113413.7 1993-7768 20131211b2013####ek#y0engy0150####ca RUS RU River Cruises Market in Russia: Problems and Solutions Journal article CHERKIZOVO Russian State University of Tourism and Service 2013 8 с. Journal article local Voyt Marina philosoph.editorum.ru