@article{MZ_1967__101_170838,
     author = {Ulrich Christian},
     title = {A {Reduction} {Theory} for {Symplectic} {Matrices.}},
     journal = {Mathematische Zeitschrift},
     pages = {213--244},
     year = {1967},
     volume = {101},
     zbl = {0153.05302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__101_170838/}
}