Ibraheem, R., رغید, Q. Hamed, قدامة, M. Azzawi, مزاحم, A. Abdullah, and عبد. “External Optical Feedback Influance on the Pulse Analysis of the Laser Including Direct Plusing Involvement”. Journal of Education and Science (JES), vol. 17, no. 3, June 2005, pp. 127-39, doi:10.33899/edusj.2005.81550.