Castro, Luis P., and David Kapanadze. “Diffraction by a Union of Strips With Impedance Conditions in Besov and Bessel Potential Spaces”. Mathematical Modelling and Analysis 13, no. 2 (June 30, 2008): 183-194. Accessed November 25, 2024. https://jau.vgtu.lt/index.php/MMA/article/view/7001.