Zentgraf, Thomas. “Symmetry Governed Nonlinear Selection Rules in Nanophotonics .”10.1016/B978-0-323-90614-2.00011-0__Fundamentals and Applications of Nonlinear Nanophotonics, edited by Nicoae C. Panoiu, 1st ed., Elsevier, 2023, doi:10.1016/B978-0-323-90614-2.00011-0.