On conditionally $δ$-convex functions. Najdecki, A., Tabor, J., & Tabor, J. Acta Mathematica Hungarica, 128(1-2):131–138, Akadémiai Kiadó, co-published with Springer Science+ Business Media BV …, 2010.
bibtex   
@article{najdecki2010conditionally,
  title={On conditionally $\delta$-convex functions},
  author={Najdecki, Adam and Tabor, Jacek and Tabor, J{\'o}zef},
  journal={Acta Mathematica Hungarica},
  volume={128},
  number={1-2},
  pages={131--138},
  year={2010},
  publisher={Akad{\'e}miai Kiad{\'o}, co-published with Springer Science+ Business Media BV~…}
}

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