@article{JRAM_1970__243_151025,
     author = {Ulrich Christian},
     title = {\"Uber gewisse {Gleichungen} zwischen symplektischen {Matrizen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {55--65},
     publisher = {mathdoc},
     volume = {243},
     year = {1970},
     zbl = {0202.03605},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1970__243_151025/}
}