Lupşa, L. “On the Hierarchy of the Efficient Points in Linear Multiple Objective Programs With Zero-One Variables”. Anal. Numér. Théor. Approx., vol. 9, no. 2, Aug. 1980, pp. 195-07, https://ictp.acad.ro/jnaat/journal/article/view/1980-vol9-no2-art5.