Alonderis , Romas. “Specialization of Antecedent Negation Loop-Rule for a Fragment of Propositional Intuitionistic Logic Sequent Calculus”. Lietuvos matematikos rinkinys 50, no. proc. LMS (December 20, 2009): 235–240. Accessed November 21, 2024. https://journals.vu.lt./LMR/article/view/17970.