The length of the period of the simple continued fraction of $d^{1/2}$.
Cohn, J. H. E.
Pacific J. Math., Tome 73 (1977) no. 2, p. 21-32 / Harvested from Project Euclid
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Publié le : 1977-05-14
Classification:  10A30,  12A45 
@article{1102811631,
     author = {Cohn, J. H. E.},
     title = {The length of the period of the simple continued fraction of $d^{1/2}$.},
     journal = {Pacific J. Math.},
     volume = {73},
     number = {2},
     year = {1977},
     pages = { 21-32},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102811631}
}

Cohn, J. H. E. The length of the period of the simple continued fraction of $d^{1/2}$.. Pacific J. Math., Tome 73 (1977) no. 2, pp.  21-32. http://gdmltest.u-ga.fr/item/1102811631/