00598naa#a2200181#i#450# EN\\bibl\4754 20251216061839.2 1995-042X 20141210b2014####ek#y0engy0150####ca RUS RU Current regulation of provision of discounts to customers by medical institutions and insurers in Russia Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 0 с. Journal article local Kulakova Elena Tsyganov Aleksandr service-rusjournal.editorum.ru