@article{DAN_1974_218_6_a3,
     author = {I. S. Negru},
     title = {On algebraic properties of the totality of propositional logics},
     journal = {Doklady Akademii Nauk},
     pages = {1276--1279},
     publisher = {mathdoc},
     volume = {218},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_6_a3/}
}