@article{AL_1973_12_4_a5,
     author = {R. \'E. Roomel'di},
     title = {Solvability of $(-1,1)$-nilrings},
     journal = {Algebra i logika},
     pages = {478--489},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_4_a5/}
}