@article{Matkowski:2018,
  author  = "J. Matkowski and A. Witkowski",
  title   = "The function f(x) / x is v-shaped for convex f",
  journal = "The Mathematical Gazette",
  volume  = "Vol. 102",
  number  = "no. 555",
  pages   = "517--520",
  year    = "2018",
}