@article{AL_1971_10_3_a0,
     author = {A. N. Degtev},
     title = {Hypersimple sets with retraceable complements},
     journal = {Algebra i logika},
     pages = {235--246},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1971_10_3_a0/}
}