@article{Lara:2017,
  author  = "T. Lara and J. Matkowski and N. Merentes and R. Quintero and M. Wróbel",
  title   = "A generalization of m-convexity and a sandwich rheorem",
  journal = "Annales Mathematicae Silesianae",
  volume  = "Vol. 31",
  number  = "iss. 1",
  pages   = "107--126",
  year    = "2017",
}