@article{10_4153_CJM_1994_005_2,
     author = {Hurrelbrink, Jurgen},
     title = {Circulant {Graphs} and {4-Ranks} of {Ideal} {Class} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {169--183},
     year = {1994},
     volume = {46},
     number = {1},
     doi = {10.4153/CJM-1994-005-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1994-005-2/}
}