%0 Journal Article %A M. N. Rybakov %T Computational complexity of the word problem in modal algebras %J Vestnik Tverskogo gosudarstvennogo universiteta. Seriâ Prikladnaâ matematika %D 2021 %P 5-17 %N 3 %U http://geodesic.mathdoc.fr/item/VTPMK_2021_3_a0/ %G ru %F VTPMK_2021_3_a0