@article{Rybiński:1990,
  author  = "L. Rybiński",
  title   = "An application of the continuous selection theorem to the study of the fixed points of multivalued mappings",
  journal = "Journal of Mathematical Analysis and Applications",
  volume  = "Vol. 153",
  number  = "iss. 2",
  pages   = "391--396",
  year    = "1990",
}