@article{Matkowski:1995,
  author  = "J. Matkowski and M. Pycia",
  title   = "On $(\alpha,a)$-convex functions",
  journal = "Archiv der Mathematik",
  volume  = "Vol. 64",
  number  = "no 2",
  pages   = "132--138",
  year    = "1995",
}