@article{NUMA_1963__5_131570,
     author = {A.S. HOUSEHOLDER and J.A. CARPENTER},
     title = {The {Singular} {Values} of {Involutory} and of {Idempotent} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {234--237},
     publisher = {mathdoc},
     volume = {5},
     year = {1963},
     zbl = {0118.01705},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1963__5_131570/}
}