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IRE Transactions on Broadcasting > 1961 > PGBC-7 > 3 > 43 - 47
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1634 - 1636
IRE Transactions on Broadcast and Television Receivers > 1958 > BTR-4 > 2 > 88 - 91