Koyamada, Y.; Ishihara, F.; Yoshikawa, S.: 'Erratum: Band-elimination filter employing surface-acoustic-wave resonators', Electronics Letters, 1975, 11, (14), p. 312-312, DOI: 10.1049/el:19750239
IET Digital Library, https://digital-library.theiet.org/;jsessionid=jfm22lgn2w3f.x-iet-live-01content/journals/10.1049/el_19750239