Aldous, William Herbert. Thermionic vacuum tubes and their applications / [by] W.H. Aldous and Edward Appleton. - [7th ed.]. - London : New York : London : New York : Methuen ; J. Wiley, Methuen ; J. Wiley, [1961] - Methuen's monographs on physical subjects . First published in this ed. in 1958. Bibliography: p. 155-158. Subjects--Topical Terms: Vacuum-tubes.