@book{35737,
	author = {"Bahuguna, D."},
	title = {Calculus of Variations and Integral Equations:},
	publisher = {Indian Insitiute of Technology},
	address = {Kanpur},
	url = {http://video.snu.edu.in/index.php?id=9038&cat=Mathematics&course=Calculus of Variations and Integral Equations&url=Phase2_Video/111104025/mod01lec17.mp4}
}