G SK, M J. Development and Evaluation of an Efficient Second Order Non-Linear Optical Single Crystal – 2-(3-Aminopyridinium-1-yl)-3-Carboxy-Proponate Monohydrate. Photonics Lett. Pol. [Internet]. 2023 Sep. 30 [cited 2024 Nov. 20];15(3):48-50. Available from: http://m.photonics.pl/PLP/index.php/letters/article/view/15-17