@article{JRAM_1963__212_150578,
     author = {Erich H\"artter},
     title = {Einige {Bemerkungen} \"uber {Basisysteme.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {174--179},
     publisher = {mathdoc},
     volume = {212},
     year = {1963},
     zbl = {0118.28101},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1963__212_150578/}
}