00502naa#a2200169#i#450# EN\NORMA\bibl\15574 20260525050105.1 1605-6590 20170228b2017####ek#y0engy0150####ca RUS RU Freedom and Arbitrariness as Elements of Contractual Regulation of Public Relations Journal article Moscow Legal publishing house Norm 2017 0 с. Journal article local Bogdanov Evgeniy zh-szf.ru