The BBC Research & Development department have made available all their white papers since 1944 to the public for review.
2004 PLT and broadcasting - can they co-exist? - http://www.bbc.co.uk/rd/publications/whitepaper099
1944 The measurement of the performance of radio receivers -
BBC R&D Pappers - http://www.bbc.co.uk/rd/publications
BBC R&D Twitter Feed - https://twitter.com/BBCRD