@article{JRAM_1990__405_153211,
     author = {G. Martens and C. Keem and S. Kim},
     title = {On a result of {Farkas.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {112--116},
     publisher = {mathdoc},
     volume = {405},
     year = {1990},
     zbl = {0718.14020},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__405_153211/}
}