@book{129027,
	author = {Santos, Hélio Maurício and Petrobras and Congreso Latinoamericano de Perforación (11er. : 1998 oct 25-29 : Buenos Aires) and Plácido, Joao Carlos R. and Petrobras},
	title = {Vibracao da coluna de perforacao},
	publisher = {Instituto Argentino del Petróleo y del Gas, IAPG}
}