@book{1212022,
	author = {Roddy Dennis and  Coolen John},
	title = {Electronic communications},
	publisher = {Delhi Prentice-Hall of India Pvt. Ltd.     },
	year = {1995},
	address = {New},
	edition = {4},
	note = {Appendix A-B 802-809p; Index 811-820p}
}