@article{AL_2021_60_5_a1,
     author = {S. M. Dudakov and B. N. Karlov and S. L. Kuznetsov and E. M. Fofanova},
     title = {Complexity of {Lambek} calculi with modalities and of total derivability in grammars},
     journal = {Algebra i logika},
     pages = {471--496},
     publisher = {mathdoc},
     volume = {60},
     number = {5},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2021_60_5_a1/}
}