@article{Matkowski:2001,
  author  = "J. Matkowski",
  title   = "A solution of a problem of H. Haruki and Th. M. Rassia",
  journal = "Annales Mathematicae Silesianae",
  volume  = "nr 15",
  pages   = "94",
  year    = "2001",
  note    = "Uniwersytet Šl±ski, Katowice",
}