Lara T, Matkowski J, Merentes N, Quintero R, Wróbel M. A generalization of m-convexity and a sandwich theorem. Ann. Math. Sil. [Internet]. 2017 Apr. 12 [cited 2025 Dec. 6];31:107-26. Available from: https://journals.us.edu.pl/index.php/AMSIL/article/view/13943