Moniri, Morteza, and Fatemeh Shirmohammadzadeh Maleki. “Neighborhood Semantics for Basic and Intuitionistic Logic”. Logic and Logical Philosophy 24, no. 3 (August 20, 2015): 339–355. Accessed January 22, 2022. https://apcz.umk.pl/LLP/article/view/LLP.2015.015.