00474naa#a2200169#i#450# EN\NORMA\bibl\13157 20260109113446.5 1605-6590 20160919b2016####ek#y0engy0150####ca RUS RU Contract Negotiations (Concept, Legal Regulation, Rules) Journal article Moscow Legal publishing house Norm 2016 0 с. Journal article local Maleina Marina naukaru.ru