@book{89833,
	author = {International Symposium on Silvopastoral Sysstems and Mannetje, Len't.},
	title = {The importance of silvopastoral system in rural livelihoods to provide ecosystem services :},
	publisher = {Universidad Autónoma de Yucatán,},
	year = {2004.},
	address = {Mérida, Yuc. :}
}