@book{5379,
	author = {Viswanathan, Thiagarajan.},
	title = {Telecommunication switching system and networks},
	publisher = {PHI Learning Private limited;},
	year = {2009.},
	address = {New Delhi :},
	edition = {32th},
	note = {Include index},
	url = {https://drive.google.com/file/d/13iYicduYpt9DT9S5elkxM6eA2z45vmJz/view?usp=sharing}
}