Sarkar, Md Abu Hanif. “Positivity Expansion to Signed Solution for Doubly Nonlinear Parabolic Equations”. Jagannath University Journal of Science 10, no. 1 (February 7, 2024): 64–74. Accessed November 21, 2024. https://banglajol.info/index.php/JnUJSci/article/view/71256.