@article{IM_1993__111_1_144075,
     author = {D.R. Heath-Brown},
     title = {The size of {Selmer} groups for the congruent number problem.},
     journal = {Inventiones mathematicae},
     pages = {171--196},
     publisher = {mathdoc},
     volume = {111},
     number = {1},
     year = {1993},
     zbl = {0808.11041},
     url = {http://geodesic.mathdoc.fr/item/IM_1993__111_1_144075/}
}