- polyhedra, Teubner, 1891),
expanded from his
habilitation thesis Die
Grundgebilde Der
Ebenen Geometrie (The
foundations of
plane geometry, Teubner, 1895)...
-
Forlaesinger over
rationel mekanik,
Kopenhagen 1913, 2nd
edition 1920
Grundgebilde der
projectiven Geometrie, Acta Mathematica, vol. 14, 1890, 1–30 Über...