@article{AL_1968_7_3_a12,
     author = {N. S. Romanovskii},
     title = {Letter to the editor},
     journal = {Algebra i logika},
     pages = {123},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1968_7_3_a12/}
}