رستم . ز. . “Investigation of Mutual Anisotropic Heisenberg Chains Which Have Easy Axe in Ferromagnetic With Spin S=1 by Existence of External Magnetic Field”. Tishreen University Journal -Basic Sciences Series, vol. 44, no. 1, Mar. 2022, pp. 11-20, https://journal.tishreen.edu.sy/index.php/bassnc/article/view/12079.