00543naa#a2200181#i#450# EN\\bibl\1279 20240419214113.5 2073-0462 20140113b2014####ek#y0engy0150####ca RUS RU Features of effective development of tourism potential of the country: marketing aspect Journal article Kazan Kazan state agrarian University 2014 5 с. Journal article local Khismatullin Marsel Vashurov Mikhail naukaru.ru