Tzvetkov, George, Tony Spassov, and Vesselina Rangelova. “Facile Preparation of Humins-Loaded Graphitic Carbon Nitride With Improved Catalytic Activity on the Thermal Decomposition of Ammonium Perchlorate”. Proceedings of the Bulgarian Academy of Sciences 76, no. 6 (June 29, 2023): 890–896. Accessed April 22, 2024. https://proceedings.bas.bg/index.php/cr/article/view/331.