@article{AL_2002_41_4_a4,
     author = {A. A. Stepanova},
     title = {Monoids with {Stable} {Torsion-Free} {Polygons}},
     journal = {Algebra i logika},
     pages = {481--492},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2002_41_4_a4/}
}