@article{NUMA_1972__20_132204,
     author = {A. Sch\"onhage},
     title = {Unit\"are {Transformationen} gro{\ss}er {Matrizen.}},
     journal = {Numerische Mathematik},
     pages = {409--417},
     publisher = {mathdoc},
     volume = {20},
     year = {1972},
     zbl = {0252.65031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__20_132204/}
}