Golubeva, E. P. Lengths of the periods of the continued fraction expansion of quadratic irrationalities and on the class numbers of real quadratic fields. (English. Russian original) Zbl 0721.11012 J. Sov. Math. 53, No. 3, 229-237 (1991); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 168, 11-22 (1988). MSC: 11E41 11A55 11R27 11R29 11R11 11E16 PDFBibTeX XMLCite \textit{E. P. Golubeva}, J. Sov. Math. 53, No. 3, 229--237 (1991; Zbl 0721.11012); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 168, 11--22 (1988) Full Text: DOI EuDML
Golubeva, E. P. Indefinite binary quadratic forms with large class numbers. (English. Russian original) Zbl 0783.11017 J. Sov. Math. 59, No. 6, 1142-1148 (1992); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 185, 13-21 (1990). MSC: 11E12 11A55 PDFBibTeX XMLCite \textit{E. P. Golubeva}, J. Sov. Math. 59, No. 6, 13--21 (1990; Zbl 0783.11017); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 185, 13--21 (1990)
Podsypanin, E. V. Length of the period of a quadratic irrational. (English) Zbl 0481.10007 J. Sov. Math. 18, 919-923 (1982). MSC: 11A55 11J70 PDFBibTeX XMLCite \textit{E. V. Podsypanin}, J. Sov. Math. 18, 919--923 (1982; Zbl 0481.10007) Full Text: DOI