@article{MZM_2002_72_6_a6,
     author = {E. E. Zolin},
     title = {Sequential {Reflexive} {Logics} with {Noncontingency} {Operator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {853--868},
     publisher = {mathdoc},
     volume = {72},
     number = {6},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2002_72_6_a6/}
}