@article{JRAM_1936__175_149970,
     author = {Otto Haupt},
     title = {\"Uber ebene {Punktmengen} mit \"uberall unendlicher {Kr\"ummung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {221--223},
     publisher = {mathdoc},
     volume = {175},
     year = {1936},
     zbl = {0014.32701},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1936__175_149970/}
}