@article{JRAM_1961__206_150467,
     author = {C.G. Lekkerkerker},
     title = {Eine {Mordell'sche} {Methode} in der {Geometrie} der {Zahlen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {20--25},
     publisher = {mathdoc},
     volume = {206},
     year = {1961},
     zbl = {0097.03202},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1961__206_150467/}
}