@article{IVM_2022_12_a8,
     author = {Paul Schmutz Schaller},
     title = {The {Markoff} theory and the commutator subgroup $SL(2,Z)'$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {101--112},
     publisher = {mathdoc},
     number = {12},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2022_12_a8/}
}