Shahadat Hossain, and M. S. Hossain. ā€œInvestigation of Classical Systems With Complex Energy in the Field of Quantum-Classical Correspondenceā€. Global Journal of Science Frontier Research, vol. 18, no. A3, Mar. 2018, pp. 29-34, https://journalofscience.org/index.php/GJSFR/article/view/2200.