Ţigan, Ştefan. “ Optimality Conditions for Multiobjective Symmetric Convex Programming”. Rev. Anal. Numér. Théor. Approx. 25, no. 1 (August 1, 1996): 235–245. Accessed September 3, 2025. https://www.ictp.acad.ro/jnaat/journal/article/view/1996-vol25-nos1-2-art24.