@article{FORUM_1990__2_3_141634,
     author = {Peter SZ\"USZ and Andrew M. Rockett},
     title = {On the {Lengths} of the {Periods} of the {Continued} {Fractions} of {Square-Roots} of {Integers.}},
     journal = {Forum mathematicum},
     pages = {119--124},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1990},
     zbl = {0694.10011},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1990__2_3_141634/}
}