'The linear slotted waveguide array antenna' (Electromagnetic Waves, 2018), 'Slotted Waveguide Array Antennas: Theory, analysis and design', Chap. 6, pp. 93-134, DOI: 10.1049/SBEW517E_ch6
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1memb43pnldc.x-iet-live-01content/books/10.1049/sbew517e_ch6