@article{JRAM_1990__412_153278,
     author = {Charles H. Walter},
     title = {Curves on surfaces with multiple line.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {48--62},
     publisher = {mathdoc},
     volume = {412},
     year = {1990},
     zbl = {0712.14016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__412_153278/}
}