Gerla, Giangiacomo, and Bonaventura Paolillo. “Whitehead’s Pointfree Geometry and Diametric Posets”. Logic and Logical Philosophy 19, no. 4 (December 30, 2010): 289–308. Accessed April 19, 2024. https://apcz.umk.pl/LLP/article/view/LLP.2010.010.