Mikhailov, Alexander. “Determination of Supermassive Black Hole Spins in Active Galactic Nuclei”. Acta Astrophysica Taurica 3, no. 1 (March 22, 2022): 44–47. Accessed April 12, 2024. https://astrophysicatauricum.org/index.php/aat/article/view/37.