@book{21958,
	author = {Mukhopadhyay, S.},
	title = {Industrial Automation and Control:},
	publisher = {Indian Insitiute of Technology},
	address = {Kharagpur},
	url = {http://video.snu.edu.in/index.php?id=2062&cat=Electrical Engineering&course=Industrial Automation and Control&url=Phase1_Video/108105062/lec16.mp4}
}