@book{253877,
	author = {Barbosa, J. de A.},
	title = {Allelopathy of aqueous Pachyrhizus erosus L.extracts on Euphorbia heterophylla and Bidens pilosa},
	url = {http://www.scielo.br/pdf/pat/v48n1/1983-4063-pat-48-01-0059.pdf}
}