Maruşciac, I. “On Fritz John Type Optimality Criterion in Multi-Objective Optimization”.
Anal. Numér. Théor. Approx. 11, no. 1 (August 1, 1982): 109–114. Accessed April 14, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/1982-vol11-nos1-2-art13.