Spangenberg К. R. Karl. (1948). Vacuum Tubes. New York, McGRAW-HILL BOOK COMPANY, ШТС, 1948.
Chicago Style (17th ed.) CitationSpangenberg К. R. Karl. Vacuum Tubes. New York, McGRAW-HILL BOOK COMPANY, ШТС, 1948, 1948.
MLA (9th ed.) CitationSpangenberg К. R. Karl. Vacuum Tubes. New York, McGRAW-HILL BOOK COMPANY, ШТС, 1948, 1948.
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