@article{10_4153_CMB_2010_071_3,
     author = {Johnstone, Jennifer A. and Spearman, Blair K.},
     title = {Congruent {Number} {Elliptic} {Curves} with {Rank} at {Least} {Three}},
     journal = {Canadian mathematical bulletin},
     pages = {661--666},
     year = {2010},
     volume = {53},
     number = {4},
     doi = {10.4153/CMB-2010-071-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-071-3/}
}