@article{Kisielewicz:1976,
  author  = "M. Kisielewicz",
  title   = "Method of averaging for differential equations with compact convex valued solutions",
  journal = "Rendiconti di Matematica : Seria VI",
  volume  = "Vol. 9",
  number  = "nr 3",
  pages   = "1--12",
  year    = "1976",
}