Welbourn, D.B.: 'What has happened to CADCAM?', Computer-Aided Engineering Journal, 1991, 8, (6), p. 229-232, DOI: 10.1049/cae.1991.0041
IET Digital Library, https://digital-library.theiet.org/;jsessionid=e1h70f5p0ds7i.x-iet-live-01content/journals/10.1049/cae.1991.0041