Ţigan, Ştefan. “On a Quasimonotonic Max-Min Problem”. Anal. Numér. Théor. Approx. 19, no. 1 (February 1, 1990): 85–91. Accessed May 6, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no1-art14.