On the Orthogonal Stability of the Pexiderized Quadratic Equation
  The Hyers--Ulam stability of the conditional quadratic functional equation of Pexider type f(x+y)+f(x-y)=2g(x)+2h(y), x\perp y is established where \perp is a symmetric orthogonality in the sense of Ratz and f is odd. 
Mohammad Sal Moslehian