Bucker, C., A. Schult, W. Bloch, and S. Guerreiro. “Rockmagnetism and Palaeomagnetism of an Early Cretaceous/Late Jurassic Dike Swarm in Rio Grande Do Norte, Brazil”. Journal of Geophysics, Vol. 60, no. 1, Oct. 1986, pp. 129-35, https://journal.geophysicsjournal.com/JofG/article/view/126.