Ţigan, Ştefan. “Linearization Procedure and Kortanek-Evans Optimality Conditions for Symmetric Pseudo-Concave Programming”. Rev. Anal. Numér. Théor. Approx. 22, no. 1 (February 1, 1993): 113–120. Accessed April 17, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1993-vol22-no1-art12.