Panalal, K. H., S. Shrotriya, S. Naik, and B. Kulkarni. “A Case of Recurrent Achalasia Cardia With Sigmoid Esophagus Managed Laparoscopically”. International Journal of Research in Medical Sciences, vol. 12, no. 3, Feb. 2024, pp. 962-5, doi:10.18203/2320-6012.ijrms20240548.