Bakr, Mohamed; Elsherbeni, Atef; Demir, Veysel: 'Adjoint Sensitivity Analysis of High Frequency Structures with MATLAB®' (Electromagnetic Waves, 2017) DOI: 
IET Digital Library, https://digital-library.theiet.org/;jsessionid=cc61bsj5p42hq.x-iet-live-01content/books/ew/sbew525e