'Outlook for the future' (Electromagnetic Waves, 2018), 'Slotted Waveguide Array Antennas: Theory, analysis and design', Chap. 12, pp. 331-337, DOI: 10.1049/SBEW517E_ch12
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2jal5kvj2prqp.x-iet-live-01content/books/10.1049/sbew517e_ch12