Morgan, D.P.; Warne, D.H.; Selviah, D.R.: 'Narrow-aperture chirp transducers for SAW convolvers', Electronics Letters, 1982, 18, (2), p. 80-81, DOI: 10.1049/el:19820055
IET Digital Library, https://digital-library.theiet.org/;jsessionid=24tp4rm08u0ma.x-iet-live-01content/journals/10.1049/el_19820055