@article{Matkowski:1995,
  author  = "J. Matkowski and M. Pycia",
  title   = "Convex-like inequality, homogeneity, subadditivity, and a characterization of $L^p$-norm",
  journal = "Annales Polonici Mathematici",
  volume  = "Vol. 60",
  number  = "no 3",
  pages   = "221--230",
  year    = "1995",
}