@article{10_4064_cm114_2_4,
     author = {Ernst Dieterich},
     title = {Existence and construction of two-dimensional
 invariant subspaces for pairs of rotations},
     journal = {Colloquium Mathematicum},
     pages = {203--211},
     publisher = {mathdoc},
     volume = {114},
     number = {2},
     year = {2009},
     doi = {10.4064/cm114-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm114-2-4/}
}