@article{Maciejewski:1998,
  author  = "A. Maciejewski and M. Szydłowski",
  title   = "On the integrability of Bianchi cosmological models",
  journal = "Journal of Physics A : Mathematical and General",
  volume  = "Vol. 31",
  pages   = "2031--2043",
  year    = "1998",
}