@article{ZNSL_1990_185_a1,
     author = {E. P. Golubeva},
     title = {On indefinite binary quadratic forms with large class numbers},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {13--21},
     year = {1990},
     volume = {185},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_185_a1/}
}