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- Popoviciu Type Equations on Cylinders vol.67, pp.3-4, 2015, https://doi.org/10.1007/s00025-015-0440-8
- Stability Problem for Jensen–type Functional Equations of Cubic Mappings vol.22, pp.6, 2006, https://doi.org/10.1007/s10114-005-0736-9
- On extension of the solutions of the Popoviciu type equations on groups vol.147, pp.2, 2015, https://doi.org/10.1007/s10474-015-0512-y
- STABILITY OF A MIXED TYPE FUNCTIONAL EQUATION IN 3-VARIABLES vol.29, pp.4, 2007, https://doi.org/10.5831/HMJ.2007.29.4.543