Paleomagnetism of middle proterozoic (1.01 to 1.08 'GA') mafic dykes in southeastern Bahia State - Sao Francisco craton, Brazil - D'Agrella Filho, Manoel Souza; Pacca, Igor Ivory Gil; Renne, Paul; Onstott, Tullis C.; Teixeira, Wilson (Earth and Planetary Science Letters, 1990)