Digital telephony

Electric energy systems theory Elgerd, Olle Ingemar Microelectronic Circuits Sedra, A. S. High voltage engineering Kuffel, E. Networks and Systems Choudhury, D Roy Applied electromagnetics Wentworth, Stuart M. Electrical engineering handbook D., William Theory and problems of basic electrical engineering Kothari, D.P. Standard handbook for electrical engineers edited by Donald G. Fink and H. Wayne Beaty