Viertes Capitel.
Geometrische Formenlehre Theil 2, GDML_Books, (1869), p. 63 / Harvested from
Access to full text 
@article{PPN593925297+DMDLOG_0014,
     title = {Viertes Capitel.},
     booktitle = {Geometrische Formenlehre Theil 2},
     series = {GDML\_Books},
     publisher = {Vieweg},
     year = {1869},
     pages = {63},
     url = {http://dml.mathdoc.fr/item/PPN593925297+DMDLOG_0014}
}

 (éd.). Viertes Capitel., dans Geometrische Formenlehre Theil 2, GDML_Books,  (1869), p. 63. http://gdmltest.u-ga.fr/item/PPN593925297+DMDLOG_0014/