@book{69822,
	author = {Khachatryan, K. A.},
	title = {Operation of soil-working implements in hilly regions},
	publisher = {Balkema,},
	year = {1985},
	series = {Russian translations series 37},
	address = {Rotterdam :},
	note = {Trad. de la ed. original en ruso de 1963}
}