Puchuri, Liliana. “About the Stability Between a Foliation of Degree Two and the Pencil of Conics That De?Nes It”. Pro Mathematica 31, no. 61 (December 12, 2020): 33–52. Accessed October 10, 2026. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/23267.