@article{Maciejewski:1998,
  author  = "A. Maciejewski and S. Popov",
  title   = "Invariants of homogeneous ordinary differential equations",
  journal = "Reports on Mathematical Physics",
  volume  = "Vol. 41",
  number  = "no 3",
  pages   = "287--310",
  year    = "1998",
}