@article{NUMA_1971__18_132122,
     author = {R.A. Sack},
     title = {A {Fully} {Stable} {Rational} {Version} of the {QR} {Algorithm} for {Tridiagonal} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {432--441},
     publisher = {mathdoc},
     volume = {18},
     year = {1971},
     zbl = {0221.65064},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__18_132122/}
}