Opilski, Zbigniew, Tadeusz Piotr Pustelny, and Jolanta Ignac-Nowicka. “Spectral Studies of Phthalocyanines”. Photonics Letters of Poland 11, no. 2 (July 1, 2019): 53–55. Accessed May 2, 2024. http://www.photonics.pl/PLP/index.php/letters/article/view/11-17.