%0 Journal Article %A O. N. Karpenkov %T Determination of Periods of Geometric Continued Fractions for Two-Dimensional Algebraic Hyperbolic Operators %J Matematičeskie zametki %D 2010 %P 30-42 %V 88 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2010_88_1_a2/ %G ru %F MZM_2010_88_1_a2