Cardinali T. Some characterizations of functions generating K-Schur concave sums and of K-concave set-valued functions. Ann. Math. Sil. [Internet]. 1995 Sep. 29 [cited 2025 May 8];9:17-28. Available from: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14201