Fessenden, R. A. (July 1908). "Wireless telephony". Proceedings of the American Institute of Electrical Engineers. 27 (7): 1283–1358. doi:10.1109/PAIEE.1908.6742139.
Discussion of A History of Some Foundations of Modern Radio-Electronic Technology, Comments by Lloyd Espenschied, Proceedings of the IRE, July, 1959 (Vol. 47, No. 7), pp. 1254, 1256. Critique. ". . . the roots of our modern technology trace back generally to sources other than the Hammond Laboratory." Comment. Many of the roots that nourished the work of the Hammond group and its contemporaries were recorded in our paper: the pioneering work of Wilson and Evans, Tesla, Shoemaker, in basic radiodynamics; . . . of Tesla and Fessenden leading to the development of basic intermediate frequency circuitry.
