@article{AL_1995_34_1_a6,
     author = {R. Sh. Omanadze},
     title = {On a strengthening of $Q$-reducibility},
     journal = {Algebra i logika},
     pages = {79--87},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1995_34_1_a6/}
}