Nikolayev, Denys; Zhadobov, Maxim; Sauleau, Ronan; Karban, Pavel: 'Antennas for ingestible capsule telemetry' (Telecommunications, 2016), 'Advances in Body-Centric Wireless Communication: Applications and state-of-the-art', Chap. 6, pp. 143-186, DOI: 10.1049/PBTE065E_ch6
IET Digital Library, https://digital-library.theiet.org/;jsessionid=54d5b278qpj4m.x-iet-live-01content/books/10.1049/pbte065e_ch6