MathSciNet bibliographic data MR725432 (86b:39006) 39B10 (39B20) Zhao, Li Ren Existence and uniqueness theorem for the solution of the functional equation $\lambda \sb{1}f(x)+\lambda \sb{2}f\sp{[2]}(x)=F(x)$$\lambda \sb{1}f(x)+\lambda \sb{2}f\sp{[2]}(x)=F(x)$. (Chinese) J. China Univ. Sci. Tech. 13 (1983), Math. Issue, 21–27. Links to the journal or article are not yet available

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