Rebus sic stantibus Clause (Article 269 Code of Obligations) in the Conditions of the German Occupation in the General Government. The Perspective of the Polish (Non-German) Courts Legal Theses. (2022). Miscellanea Historico-Iuridica, 21(2), 245-268. https://miscellanea.uwb.edu.pl/article/view/650