1.
Beleze BA. Cláusula Rebus Sic Stantibus. Semina: Ciênc. Agrár. [Internet]. 1979 Jan. 3 [cited 2026 May 2];1(3):35-9. Available from: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/5787