E.M. Badr, M.I. Moussa. On Jump-Critical Ordered Sets with Jump Number Four. J. Adv. App. Comput. Math. [Internet]. 2014 Oct. 10 [cited 2024 Dec. 23];1(1):8-13. Available from: https://avantipublisher.com/index.php/jaacm/article/view/55