Guarnieri, M. (2012). „The age of vacuum tubes: Early devices and the rise of radio communications”. IEEE Ind. Electron. M.: 41—43. S2CID23351454. doi:10.1109/MIE.2012.2182822.
Guarnieri, M. (2012). „The age of vacuum tubes: the conquest of analog communications”. IEEE Ind. Electron. M.: 52—54. S2CID42357863. doi:10.1109/MIE.2012.2193274.
Guarnieri, M. (2012). „The age of vacuum tubes: Early devices and the rise of radio communications”. IEEE Ind. Electron. M.: 41—43. S2CID23351454. doi:10.1109/MIE.2012.2182822.
Guarnieri, M. (2012). „The age of vacuum tubes: the conquest of analog communications”. IEEE Ind. Electron. M.: 52—54. S2CID42357863. doi:10.1109/MIE.2012.2193274.