Ryckelynck , P. and Smoch, L. (2017) “On the functional equation αu + C ⋆ (χu) = f”, North-Western European Journal of Mathematics, (4), pp. 1–20. Available at: https://nwejm.univ-lille.fr/index.php/nwejm/article/view/42 (Accessed: 22 November 2024).