@article{IM2_2021_85_4_a2,
     author = {O. N. German and I. A. Tlyustangelov},
     title = {Symmetries of a two-dimensional continued fraction},
     journal = {Izvestiya. Mathematics },
     pages = {666--680},
     publisher = {mathdoc},
     volume = {85},
     number = {4},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2021_85_4_a2/}
}