'The slot antenna' (Electromagnetic Waves, 2018), 'Slotted Waveguide Array Antennas: Theory, analysis and design', Chap. 4, pp. 25-58, DOI: 10.1049/SBEW517E_ch4
IET Digital Library, https://digital-library.theiet.org/;jsessionid=395d40ngccgg5.x-iet-live-01content/books/10.1049/sbew517e_ch4