@article{MOMA_1968__72_177430,
     author = {Ulrich Christian},
     title = {\"Uber elliptische {Fixpunkte} symplektischer {Matrizen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {289--295},
     publisher = {mathdoc},
     volume = {72},
     year = {1968},
     zbl = {0165.34703},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1968__72_177430/}
}