research paper improved radio sonde and its performance / by Harry Diamond [et al.] Technical dictionary of the terms used in electrical engineering, radio, television, electrical communication : including the most used terms of acoustics, illumination, mathematics, materials, mechanics, … jaar PCJ, October 1945 - October 1946 : uittreksels uit brieven van luisteraars Radio engineering / by Frederick Emmons Terman nieuwe handboek der radiotechniek / door A. Dominicus van den Berg
