Fischer, Peer Max Planck Institute for Medical Research, Max Planck Society;
https://www.sciencedirect.com/science/article/pii/S0009261400011490?via%3Dihub (Any fulltext)
https://www.sciencedirect.com/science/article/pii/S0009261400011490/pdfft?md5=96977e40315cb8e0a3fd33eb4f86b7dc&pid=1-s2.0-S0009261400011490-main.pdf (Any fulltext)
Champagne, B., Fischer, P., & Buckingham, A. D. (2000). Ab initio investigation of the sum-frequency hyperpolarizability of small chiral molecules. Chemical Physics Letters, 331(1), 83-88. doi:10.1016/S0009-2614(00)01149-0.