Tralli, Giulio. “Characterizing Spheres in ℂ2 by Their Levi Curvature: A Result à La Jellett”. Bruno Pini Mathematical Analysis Seminar 8, no. 1 (January 1, 2017): 90–101. Accessed April 28, 2024. https://mathematicalanalysis.unibo.it/article/view/7692.