@book{10931,
	author = { Patra,  Nihar Ranjan.	},
	title = {Advance Geotechnological Engineering ( Pdf Lecture Module 170)},
	publisher = {Indian Institute of Technology , Kanpur.},
	address = {IIT Kanpur.},
	url = {http://nptel.ac.in/courses/105104132/Module4/lecture20.pdf}
}