Stability of the Quadratic Equation of Pexider Type

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STABILITY OF FUNCTIONAL EQUATIONS IN NON-ARCHIMEDEAN SPACES (2007, background): “Jung [15] dealt with stability problems for the quadratic functional equation of Pexider type f1(x+ y)+ f2(x− y) = f3(x) + f4(y).”
Stability of a functional equation of Drygas (2002, background): “Various works on stability of the quadratic functional equation can be found in Skof [19], Cholewa [4], Fenyő [9], Ger [10], Czerwik [5], [6], Borelli and Forti [3], Jung [15], [16], and Rassias [18].”
Remarks on the stability of Drygas’ equation and the Pexider-quadratic equation (2004, background): “Among them, references [ 8 ] and [9] studied the stabilities of the Drygas’ equation and Pexider-quadratic equation, respectively.”
Solution and Stability of the Multiquadratic Functional Equation (2013, background): “On the other hand, the stability problem for the quadratic functional equation has been studied by many mathematicians under various degrees of generality imposed on the equation or on the underlying space; see, for example, [15–20] and the references therein.”