Ghosh A, Mondal S, Islam K, Mal K, Bhattacharyya D, Bandyopadhyay A. Study of Three Level Cascade System: A Complete Analytical Approach. Jour. Atomic Mole. Conden. Nano Phys [Internet]. 2016 Aug. 22 [cited 2024 May 2];3(2):97-104. Available from: http://www.rgnpublications.com/journals/index.php/jamcnp/article/view/483