@article{Maciejewski:2009,
author
=
"A.Maciejewski and M.Przybylska",
title
=
"Darboux polynomials and first integrals of natural polynomial Hamiltonian systems",
journal
=
"Physics Letters, Section A: General, Atomic and Solid State Physics",
number
=
"no 326",
pages
=
"219--226",
year
=
"2004",
}