Rédei László: Foundation of Euclidean and non-Euclidean geometries accordin to F. Klein (Budapest, 1968)
FOUNDATION OF EUCLIDEAN AND NON-EUCLIDEAN GEOMETRIES ACCORDING TO F. KLEIN BY L. RÉDEI MATHEMATICAL INSTITUTE, JÓZSEF ATTILA UNIVERSITY SZEGED, HUNGARY AKADÉMIAI KIADÓ, BUDAPEST 1968