@article{MZM_1989_45_5_a11,
     author = {A. D. Yashin},
     title = {Semantic characterization of certain sets of intuitionistic logical connectives},
     journal = {Matemati\v{c}eskie zametki},
     pages = {103--113},
     year = {1989},
     volume = {45},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_5_a11/}
}