@article{Kisielewicz:1975,
  author  = "M. Kisielewicz",
  title   = "On some application of Bogolubovs method for hyperbolic equations",
  journal = "Annales Polonici Mathematici",
  volume  = "Vol. 30",
  number  = "no 3",
  pages   = "252--268",
  year    = "1975",
}