Popovici, Nicolae. “On a Special Class of Pareto Bicriterial Optimization Problems”. Anal. Numér. Théor. Approx. 19, no. 2 (August 1, 1990): 163–168. Accessed April 14, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no2-art11.