Sakalauskaitė, Jūratė. “Partial Cut Elimination for Combinations of Propositional Multi-Modal Logics With past Time”. Lietuvos matematikos rinkinys 52, no. proc. LMS (December 15, 2011): 257–261. Accessed November 26, 2025. https://www.zurnalai.vu.lt/LMR/article/view/15443.