@article{GDZPPN002084015,
title = {On the Lengths of the Periods of the Continued Fractions of Square-Roots of Integers.},
journal = {Forum mathematicum},
volume = {2},
year = {1990},
pages = {119-124},
zbl = {0694.10011},
url = {http://dml.mathdoc.fr/item/GDZPPN002084015}
}
SZÜSZ, Peter; Rockett, Andrew M. On the Lengths of the Periods of the Continued Fractions of Square-Roots of Integers.. Forum mathematicum, Tome 2 (1990) pp. 119-124. http://gdmltest.u-ga.fr/item/GDZPPN002084015/