@book{21984,
	author = {Gy, Pierre.},
	title = {Sampling of particulate materials},
	publisher = {Elsevier Scientific Pub. Co.},
	year = {1982.},
	series = {Developments in geomathematics},
	address = {Amsterdam},
	edition = {2nd rev. ed.},
	note = {Includes index.}
}