@article{MZM_2012_91_3_a1,
     author = {E. V. Dashkov},
     title = {On the {Positive} {Fragment} of the {Polymodal} {Provability} {Logic} $\mathbf{GLP}$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {331--346},
     publisher = {mathdoc},
     volume = {91},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2012_91_3_a1/}
}