@book{83387,
	author = {Wossink, Grada Antonia Arendina and Kooten, Gerrit Cornelius van and Symposium of the International Association of Agricultural Economits Held at Wageningen,},
	title = {Economics of agro-chemicals :},
	publisher = {Ashgate,},
	year = {1998.},
	address = {London, Eng. :}
}