“Alteração Das circunstâncias, modificação E resolução Do Contrato Unexpected Circumstances, Modification and Termination of Contracts”. Revista de Derecho Civil 10, no. 1 (April 17, 2023): pp. 3–57. Accessed April 25, 2026. https://www.nreg.es/ojs/index.php/RDC/article/view/883.