00508naa#a2200169#i#450# EN\\bibl\2509 20240505201007.7 1995-0411 20140605b2014####ek#y0engy0150####ca RUS RU The economic potential of amateur tourism in Russia Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 8 с. Journal article local Lepeshkin Vyacheslav spst-journal.editorum.ru