@article{AL_1967_6_4_a8,
     author = {N. S. Romanovskii},
     title = {Maximal subrings of the field $Q$ and maximal subgroups of the},
     journal = {Algebra i logika},
     pages = {75--82},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1967_6_4_a8/}
}