@article{NUMA_1990__57_6-7_133476,
     author = {W.B. Gragg and L. Reichel},
     title = {A {Divide} and {Conquer} {Method} for {Unitary} and {Orthogonal} {Eigenproblems.}},
     journal = {Numerische Mathematik},
     pages = {695--718},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0708.65039},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133476/}
}