@article{NUMA_1966__8_131714,
     author = {J. PONSTEIN},
     title = {Splitting {Certain} {Eigenvalue} {Eigenvector} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {412--421},
     publisher = {mathdoc},
     volume = {8},
     year = {1966},
     zbl = {0228.65030},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1966__8_131714/}
}