Geodesic
Distribution of norms of prime hyperbolic classes
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 14, Tome 237 (1997), pp. 40-45 
E. P. Golubeva. Distribution of norms of prime hyperbolic classes. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 14, Tome 237 (1997), pp. 40-45. http://geodesic.mathdoc.fr/item/ZNSL_1997_237_a4/
@article{ZNSL_1997_237_a4,
     author = {E. P. Golubeva},
     title = {Distribution of norms of prime hyperbolic classes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--45},
     year = {1997},
     volume = {237},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_237_a4/}
}
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We prove that the asymptotic formula for the number of primitive hyperbolic classes includes no summands corresponding to the discriminants $d$ of indefinite binary quadratic forms such that $h(d) for a certain constant $c>0$. A similar result is obtained for prime discriminants.