@article{NSJOM_2008_38_1a_7,
     author = {A. Tekcan},
     title = {On indefinite binary quadratic forms and

 quadratic ideals},
     journal = {Novi Sad Journal of Mathematics},
     pages = {83-96},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2008_38_1a_7/}
}