Signerski, Ryszard, and Grazyna Jarosz. “Diffusion Length of Singlet Excitons in Copper Phthalocyanine Films”. Photonics Letters of Poland 3, no. 3 (September 29, 2011): pp. 107–109. Accessed April 26, 2024. https://www.photonics.pl/PLP/index.php/letters/article/view/3-38.