@article{10_4064_aa_60_4_321_334,
     author = {Steven Arno},
     title = {The imaginary quadratic fields of class number 4},
     journal = {Acta Arithmetica},
     pages = {321--334},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     doi = {10.4064/aa-60-4-321-334},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-60-4-321-334/}
}