'Review of electromagnetic theory' (Electromagnetic Waves, 2018), 'Slotted Waveguide Array Antennas: Theory, analysis and design', Chap. 2, pp. 5-16, DOI: 10.1049/SBEW517E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=gp57gnujpv0q.x-iet-live-01content/books/10.1049/sbew517e_ch2