Cayleys Grundsatz: projective geometry is all geometry.
Geometrie Bd. 2, GDML_Books, (1968), p. 145 / Harvested from
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@article{PPN37649882X+dmdlog85,
     title = {Cayleys Grundsatz: projective geometry is all geometry.},
     booktitle = {Geometrie Bd. 2},
     series = {GDML\_Books},
     year = {1968},
     pages = {145},
     url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog85}
}

 (éd.). Cayleys Grundsatz: projective geometry is all geometry., dans Geometrie Bd. 2, GDML_Books,  (1968), p. 145. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog85/