@article{10_4064_sm_31_5_523_530,
     author = {Irving Kaplansky},
     title = {Composition of binary quadratic forms},
     journal = {Studia Mathematica},
     pages = {523--530},
     publisher = {mathdoc},
     volume = {31},
     number = {5},
     year = {1968},
     doi = {10.4064/sm-31-5-523-530},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-31-5-523-530/}
}