@article{Maciejewski:2000,
  author  = "A. Maciejewski and M. Szydłowski",
  title   = "Towards a description of complexity of the simplest cosmological systems",
  journal = "Journal of Physics A : Mathematical and General",
  volume  = "Vol. 33",
  pages   = "9241--9254",
  year    = "2000",
}