00519naa#a2200169#i#450# EN\\bibl\12158 20260314225953.6 1995-042X 20160921b2016####ek#y0engy0150####ca RUS RU Systematic approach to the quality assessment of river cruise product Journal article CHERKIZOVO Russian State University of Tourism and Service 2016 14 с. Journal article local Bezrukova Natalya rguts.editorum.ru