Folanda QPE, Adolf H, Trisnamansyah P. Pemberlakuan Klausula Hardship berdasarkan Asas Freedom of Contract dalam Kontrak Jual Beli Batubara . Innovative [Internet]. 2023 Jun. 16 [cited 2026 Apr. 19];3(2):11739-53. Available from: https://j-innovative.org/index.php/Innovative/article/view/1387