@article{MZM_2010_88_1_a2,
     author = {O. N. Karpenkov},
     title = {Determination of {Periods} of {Geometric} {Continued} {Fractions} for {Two-Dimensional} {Algebraic} {Hyperbolic} {Operators}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {30--42},
     publisher = {mathdoc},
     volume = {88},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2010_88_1_a2/}
}