@article{Maciejewski:2009,
author
=
"A.Maciejewski and M.Przybylska",
title
=
"Non-integrability of the generalized two fixed centres problem",
journal
=
"Celestial Mechanics and Dynamical Astronomy",
number
=
"no 89",
pages
=
"145--164",
year
=
"2004",
}