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@article{MOMA_1984__98_178190, author = {H\"useyin Kocak}, title = {Quadratic {Integrals} of {Linear} {Hamiltonian} {Systems.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {53--64}, publisher = {mathdoc}, volume = {98}, year = {1984}, zbl = {0541.34021}, url = {http://geodesic.mathdoc.fr/item/MOMA_1984__98_178190/} }
Hüseyin Kocak. Quadratic Integrals of Linear Hamiltonian Systems.. Monatshefte für Mathematik, Tome 98 (1984), pp. 53-64. http://geodesic.mathdoc.fr/item/MOMA_1984__98_178190/