[1]
Andrikonis, J. and Pliuškevičius, R. 2011. Contraction-free calculi for modal logics S5 and KD45. Lietuvos matematikos rinkinys. 52, proc. LMS (Dec. 2011), 237–242. DOI:https://doi.org/10.15388/LMR.2011.ml03.