Emelichev, V. A., & Platonov, A. A. (2006). About one discrete analog of Hausdorff semi-continuity of suitable mapping in a vector combinatorial problem with a parametric principle of optimality ("from Slater to lexicographic"). Rev. Anal. Numér. Théor. Approx., 35(2), 131–139. https://doi.org/10.33993/jnaat352-839