Geodesic
The question of single-class genera of positive binary quadratic forms
Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 4, Tome 67 (1977), pp. 144-155

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A technique is developed for computing the orders of parabolic modular forms at the vertices of the fundamental domain. Certain sufficient conditions are obtained for the single-class property of genera of positive binary quadratic forms. 
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     author = {A. B. Voronetskii},
     title = {The question of single-class genera of positive binary quadratic forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {144--155},
     publisher = {mathdoc},
     volume = {67},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_67_a5/}
}
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A. B. Voronetskii. The question of single-class genera of positive binary quadratic forms. Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 4, Tome 67 (1977), pp. 144-155. http://geodesic.mathdoc.fr/item/ZNSL_1977_67_a5/