Lüthi, Hans Peter, and Stefan Portmann. “Bringing Theory to the Classroom: Summer School in Computational Quantum Chemistry (CQCS-98): Computational Chemistry Column”. CHIMIA 53, no. 1-2 (February 24, 1999): 41. Accessed May 1, 2024. https://www.chimia.ch/chimia/article/view/1999_041.