00667naa#a2200181#i#450# EN\NORMA\bibl\34318 20251223235604.2 1991-3222 20200109b2020####ek#y0engy0150####ca RU Qualification of Agreement with the Obligation to Achieve an Immaterial Result on the Example of Energy-Service Agreement Journal article Moscow Legal publishing house Norm 2020 0 с. Journal article local Право. Юридические науки. 34 Право. Юридические науки. 67 bbk Minskaya Mariya Maksimovna naukaru.ru