@book{216629,
	author = {Sobral, L.F.},
	title = {Lime and gypsum to improve root depth of orange crop in an Ultisol of the Coastal Tablelands },
	url = {http://www.scielo.br/scielo.php?script=sci_arttext
pid=S1415-43662009000700004
lng=en
nrm=iso
tlng=pt}
}