@article{GDZPPN002484307,
title = {Quadratic Integrals of Linear Hamiltonian Systems.},
journal = {Monatshefte f\"ur Mathematik},
volume = {98},
year = {1984},
pages = {53-64},
zbl = {0541.34021},
url = {http://dml.mathdoc.fr/item/GDZPPN002484307}
}
Kocak, Hüseyin. Quadratic Integrals of Linear Hamiltonian Systems.. Monatshefte für Mathematik, Tome 98 (1984) pp. 53-64. http://gdmltest.u-ga.fr/item/GDZPPN002484307/