LUCA, Traian Ionuț, and Dorel I. DUCA. “Approximations of Bi-Criteria Optimization Problem”. Studia Universitatis Babeș-Bolyai Mathematica 63, no. 4 (December 20, 2018): 549–559. Accessed January 19, 2026. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2175.