Trypuz, Robert, and Piotr Kulicki. “A Systematics of Deontic Action Logics Based on Boolean Algebra”. Logic and Logical Philosophy 18, no. 3-4 (March 30, 2010): 253–270. Accessed June 30, 2024. https://apcz.umk.pl/LLP/article/view/LLP.2009.012.