Prakash, S., and M. Subbiah. “Eigenvalue Bounds in an Azimuthal Instability Problem of Inviscid Swirling Flows”. The Journal of the Indian Mathematical Society 89, no. 3-4 (August 23, 2022): 387–405. Accessed April 20, 2024. https://informaticsjournals.com/index.php/jims/article/view/29629.