Darajat, Reekha Aysi, and Helma Helma. “An Analysis of Cardano’s Formula to Solved Cubic Equation”. Rangkiang Mathematics Journal 4, no. 2 (October 31, 2025): 101–110. Accessed April 29, 2026. https://math.ppj.unp.ac.id/index.php/RMJ/article/view/64.