@article{MZ_1973__132_171927,
     author = {Dieter Betten},
     title = {Die komplex-hyperbolische {Ebene.}},
     journal = {Mathematische Zeitschrift},
     pages = {249--260},
     publisher = {mathdoc},
     volume = {132},
     year = {1973},
     zbl = {0263.50011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__132_171927/}
}