Gambling, W.A.; Payne, D.N.; Sunak, H.: 'Pulse dispersion in glass fibres', Electronics Letters, 1971, 7, (18), p. 549-550, DOI: 10.1049/el:19710371
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2dtg4v4280200.x-iet-live-01content/journals/10.1049/el_19710371