A. BADRAN, Hussain. Experimental Evidence of an Optical Bistability Based on Self - Focusing. University of Thi-Qar Journal of Science, University of Thi-Qar, Thi-Qar, Iraq, v. 3, n. 2, p. 190–193, 2012. Disponível em: http://www.jsci.utq.edu.iq/index.php/main/article/view/428.. Acesso em: 12 may. 2025.