@article{MZ_1969__109_171144,
     author = {Armin Frei},
     title = {Some {Remarks} on {Triples.}},
     journal = {Mathematische Zeitschrift},
     pages = {269--272},
     publisher = {mathdoc},
     volume = {109},
     year = {1969},
     zbl = {0181.02402},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__109_171144/}
}