Ida, Nathan: 'Appendix D. Selected elements of electromagnetics' (Control, Robotics and Sensors, 2018), 'Open Resonator Microwave Sensor Systems for Industrial Gauging: A practical design approach', Chap. appendixd, pp. 355-383, DOI: 10.1049/PBCE103E_appendixd
IET Digital Library, https://digital-library.theiet.org/;jsessionid=gggau3tbfglb.x-iet-live-01content/books/10.1049/pbce103e_appendixd