Popovici, Nicolae. “Convexité Au Sens Direct Ou Inverse Et Applications Dans l’optimisation Vectorielle: Direct or Inverse Convexity and Applications in Vector Optimization”. Rev. Anal. Numér. Théor. Approx. 29, no. 1 (February 1, 2000): 75–82. Accessed April 11, 2025. https://ictp.acad.ro/jnaat/journal/article/view/2000-vol29-no1-art7.