@article{AL_2014_53_6_a7,
     author = {S. A. Drobyshevich},
     title = {Some modal operators over intuitionistic logic},
     journal = {Algebra i logika},
     pages = {770--775},
     publisher = {mathdoc},
     volume = {53},
     number = {6},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2014_53_6_a7/}
}