Dreiundzwanzigster - Dreissigster Vortrag.
Die Geometrie der Lage Abth. 2, GDML_Books, (1880), p. 180 / Harvested from
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@article{PPN591331985+DMDLOG_0006,
     title = {Dreiundzwanzigster - Dreissigster  Vortrag.},
     booktitle = {Die Geometrie der Lage Abth. 2},
     series = {GDML\_Books},
     publisher = {R\"umpler},
     address = {Hannover},
     year = {1880},
     pages = {180},
     url = {http://dml.mathdoc.fr/item/PPN591331985+DMDLOG_0006}
}

 (éd.). Dreiundzwanzigster - Dreissigster  Vortrag., dans Die Geometrie der Lage Abth. 2, GDML_Books,  (1880), p. 180. http://gdmltest.u-ga.fr/item/PPN591331985+DMDLOG_0006/