“Multidimensional Quantum Tunneling: Direct Instanton Calculation with Application to Polyatomic Molecules”, Commun. Comput. Phys., vol. 1, no. 6, pp. 1096–1116, July 2020, Accessed: Mar. 14, 2026. [Online]. Available: https://gsp.tricubic.dev/cicp/article/view/5443