Figueiredo, Giovany M., Eugenio Massa, and Jefferson A. Santos. “Existence of Positive Solutions for a Class of Semipositone Problems With Kirchhoff Operator”. Annales Fennici Mathematici 46, no. 2 (August 2, 2021): 655–666. Accessed April 16, 2024. https://afm.journal.fi/article/view/110567.