00649naa#a2200193#i#450# EN\\bibl\20855 20240419130457.5 1993-7768 20180504b2018####ek#y0engy0150####ca RUS RU «Shady» business in tourism and economic security of Russia Journal article CHERKIZOVO Russian State University of Tourism and Service 2018 6 с. Journal article local Туристско-экскурсионное обслуживание. 71.37 grnti Chirkov Dmitrii K. Chirkova Yuliya B. philosoph.editorum.ru