Michailidis, E.; Tsimenidis, C.C.; Chester, E.G.: 'Parametric study of dual and wide band PIFA', IET Conference Proceedings, 2008, p. 145-159, DOI: 10.1049/ic:20080092
IET Digital Library, https://digital-library.theiet.org/;jsessionid=a77pe9gg3r360.x-iet-live-01content/conferences/10.1049/ic_20080092