Johnson, E.A.: 'Touch display—a novel input/output device for computers', Electronics Letters, 1965, 1, (8), p. 219-220, DOI: 10.1049/el:19650200
IET Digital Library, https://digital-library.theiet.org/;jsessionid=5da27jnddgs89.x-iet-live-01content/journals/10.1049/el_19650200