@article{DAN_1975_220_1_a8,
     author = {N. N. Nepeivoda},
     title = {The language $\Delta$ with intuitionistic connectives},
     journal = {Doklady Akademii Nauk},
     pages = {41--43},
     publisher = {mathdoc},
     volume = {220},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_1_a8/}
}