Tamirat Abebe. “The Effect of Parametric Amplifier on Entanglement and Statistical Properties of Nondegenerate Three-Level Laser Pumped by Electron Bombardment”. Global Journal of Science Frontier Research 18, no. A9 (May 15, 2018): 19–30. Accessed May 3, 2024. https://journalofscience.org/index.php/GJSFR/article/view/2345.