'Adjoint sensitivity analysis of anisotropic structures' (Electromagnetic Waves, 2017), 'Adjoint Sensitivity Analysis of High Frequency Structures with MATLAB®', Chap. 7, pp. 175-191, DOI: 10.1049/SBEW525E_ch7
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1dtd5dpvnsx1c.x-iet-live-01content/books/10.1049/sbew525e_ch7