Garratt-Smithson, Lilian, Jason Watson, Magdalena Szczykulska, and Alistair Muir. “P4_6 Orbiting a Black Hole”. Physics Special Topics 12, no. 1 (December 6, 2013). Accessed June 11, 2025. https://journals.le.ac.uk/index.php/pst/article/view/2171.