Khare, Mona, and Soni Gupta. “Non-Additive Measures, Envelopes and Extensions to Quasi-Measures”. Sarajevo Journal of Mathematics 6, no. 1 (June 11, 2024): 35–49. Accessed October 15, 2024. https://sjm.anubih.ba/index.php/sjm/article/view/324.