Fine, Benjamin, Olga G. Kharlampovich, Alexei G. Myasnikov, Vladimir N. Remeslennikov, and Gerhard Rosenberger. “On the Surface Group Conjecture”. Scientia Series A: Mathematical Sciences 15 (January 11, 2007): 1–15. Accessed June 7, 2025. https://revistas.usm.cl/scientia/article/view/96.