@article{VTPMK_2021_3_a0,
     author = {M. N. Rybakov},
     title = {Computational complexity of the word problem in modal algebras},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {5--17},
     publisher = {mathdoc},
     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2021_3_a0/}
}