@article{10_4064_aa_15_1_23_44,
     author = {G. Pall and Hubert Butts},
     title = {Modules and binary quadratic forms},
     journal = {Acta Arithmetica},
     pages = {23--44},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1968},
     doi = {10.4064/aa-15-1-23-44},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-15-1-23-44/}
}