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Światak, H., On the Regularity of the Distributional and Continuous Solutions of the Functional Equations\(\sum\limits_{i = 1}^k {a_i (x,t){\text{ }}f(x + \varphi _i (t)) = b(x,t)}\), Aequationes Math.1, 6–19 (1968).
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Światak, H. On the regularity of the locally integrable solutions of the functional equations\(\sum\limits_{i = 1}^k {a_i (x,t){\text{ }}f(x + \varphi _i (t)) = b(x,t)}\) . Aeq. Math. 4, 291–296 (1970). https://doi.org/10.1007/BF01844158
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DOI: https://doi.org/10.1007/BF01844158