%0 Journal Article %A M. A. Korolev %T On the period of the continued fraction expansion for $\sqrt{d}$ %J Izvestiya. Mathematics %D 2025 %P 26-49 %V 89 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2025_89_1_a2/ %G en %F IM2_2025_89_1_a2