Geodesic
On a lenght of the continued fraction's period
Problemy analiza, no. 1 (1993), pp. 85-90.

Voir la notice de l'article provenant de la source Math-Net.Ru

В статье дана оценка количества чисел $d$ отрезка натурального ряда, для которых непрерывная дробь для $\sqrt{d}$ имеет больший период. 
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     author = {B. M. Shirokov},
     title = {On a lenght of the continued fraction's period},
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B. M. Shirokov. On a lenght of the continued fraction's period. Problemy analiza, no. 1 (1993), pp. 85-90. http://geodesic.mathdoc.fr/item/PA_1993_1_a12/