@article{AL_1989_28_1_a7,
     author = {Yu. D. Shmidt},
     title = {The property of $t$-retraceability and automorphisms of the},
     journal = {Algebra i logika},
     pages = {105--116},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1989_28_1_a7/}
}