Heidarkhani, Shapour, and Ghasem Alizadeh Afrouzi. “Some Multiplicity Results to the Existence of Three Solutions for a Dirichlet Boundary Value Problem Involving the P-Laplacian”. Mathematical Modelling and Analysis 16, no. 3 (August 24, 2011): 390-400. Accessed April 20, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/5542.