Kumar, Shubham, and Deepmala. “On Unique Solvability of the Piecewise Linear Equation System”. J. Numer. Anal. Approx. Theory 51, no. 2 (December 31, 2022): 181–188. Accessed February 25, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1271.