@article{10_4153_CJM_1997_027_0,
     author = {Pal, Janos and Schlomiuk, Dana},
     title = {Summing up the {Dynamics} of {Quadratic} {Hamiltonian} {Systems} {With} a {Center}},
     journal = {Canadian journal of mathematics},
     pages = {582--599},
     year = {1997},
     volume = {49},
     number = {3},
     doi = {10.4153/CJM-1997-027-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1997-027-0/}
}