On the stability of a functional equation deriving from an inequality of Popoviciu for convex functions

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Homomorphisms between Poisson JC*-Algebras (2005, unknown): “Now we are going to show the Cauchy–Rassias stability of homomorphisms in Poisson JC∗-algebras associated with the Trif functional equation.”
HOMOMORPHISMS BETWEEN LIE JC∗-ALGEBRAS AND CAUCHY-RASSIAS STABILITY OF LIE JC∗-ALGEBRA DERIVATIONS (2005, unknown): “[8] —, Modified Trif ’s functional equations in Banach modules over a C∗ - algebra and approximate algebra homomorphisms, J. Math.”
Homomorphisms between JC*–algebras and Lie C*–algebras (2005, background): “Recently, Trif [ 5 ] proved the stability of a functional equation deriving from an inequality of Popoviciu for convex functions.”
Modified Trif's functional equations in Banach modules over a C∗-algebra and approximate algebra homomorphisms (2003, background): “Recently, Trif [10] generalized the Popoviciu functional equation”
HOMOMORPHISMS BETWEEN C*-ALGEBRAS ASSOCIATED WITH THE TRIF FUNCTIONAL EQUATION AND LINEAR DERIVATIONS ON C*-ALGEBRAS (2004, unknown): “Recently, Trif [8] proved the following: let q := l(d−1) d−l , r := − l d−l .”
Lie ∗-homomorphisms between Lie C∗-algebras and Lie ∗-derivations on Lie C∗-algebras (2004, unknown): “It follows from Trif theorem [9, Theo rem 3.1] that there exists a unique additive mappingL :A → B satisfying the inequality (2.xiii).”