00629naa#a2200193#i#450# EN\NORMA\bibl\41774 /en/manage/index 20250312060313.3 1991-3222 20210112b2021####ek#y0engy0150####ca RU Regulation of Unforeseen Circumstances in the Relations of Obligations in German Law Journal article Moscow Legal publishing house Norm 2021 0 с. Journal article local Право. Юридические науки. 34 Aliev Azer Libik Rebekka test.editorum.ru /en/manage/index