Oedipus, that's the closest I can get from the internet. It's from a paper by Michael Gerzon. Now if you disagree with it, or indeed have contradictory information from AES, please do let us know.

Otherwise, I fail to see a point to your questioning other than to suggest Blumlein never said anything, something already hinted at by me earlier. That is of little importance if the great minds like Gerzon's and those at AES happen to agree with the theory is it?