References
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- K. Baron and Z. Kominek, On functionals with the Cauchy difference bounded by a homogeneous functional, Bull. Polish Acad. Sci. Math. 51 (2003), no. 3, 301–307.
- M. Kuczma, An Introduction to the Theory of Functional Equations and Inequalities, Second Ed., Birkhäuser Verlag, Basel, 2009.
- T. Małolepszy and J. Matkowski, Bilinearity of the Cauchy differences, manuscript.
- S. Rolewicz, Φ-convex functions defined on metric spaces, J. Math. Sci. (N.Y.) 115 (2003), no. 5, 2631–2652.