@article{MAN_1985__273_164059,
     author = {Gerhard Kramarz},
     title = {All {Congruent} {Numbers} {Less} than 2000.},
     journal = {Mathematische Annalen},
     pages = {337--340},
     publisher = {mathdoc},
     volume = {273},
     year = {1985},
     zbl = {0561.10007},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__273_164059/}
}