@article{Jarczyk:2002,
  author  = "W. Jarczyk and J. Matkowski",
  title   = "On Mulholland's inequality",
  journal = "Proceedings of the American Mathematical Society",
  volume  = "Vol. 130",
  number  = "no 11",
  pages   = "3243--3247",
  year    = "2002",
}