@article{ZNSL_1971_20_a19,
     author = {Yu. N. Tolstova},
     title = {On some weakening of intuitionistic logic},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {208--219},
     year = {1971},
     volume = {20},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_20_a19/}
}