1. S. Agmon, A representation theorem for solutions of the Helmholtz equation and resolvent estimates for the Laplacian, in: Analysis, et cetera, Academic Press, Boston, MA, 1990, pp. 39--76.
2. A. Cialdea, On the oblique derivation problem for the Laplace equation, and related topics, Rend. Accad. Naz. Sci. XL Mem. Mat. (5) 12(1988), No. 1, 181--200.
3. A. Cialdea, The simple-layer potential approach to the Dirichlet problem: an extension to higher dimensions of Muskhelishvili method and applications, in: C. Constanda, M. Dalla Riva, P. D. Lamberti, P. Musolino (Eds.), Integral methods in science and engineering. Vol. 1. Theoretical techniques, Birkhauser/Springer, Cham, 2017, pp. 59--69.
4. A. Cialdea, G. C. Hsiao, Regularization for some boundary integral equations of the first kind in mechanics, Rend. Accad. Naz. Sci. XL Mem. Mat. Appl. (5) 19(1995), No. 1, 25--42.
5. The Dirichlet Problem for Second-Order Divergence Form Elliptic Operators with Variable Coefficients: The Simple Layer Potential Ansatz