by Kroonenberg, S.B., de Roever, E.W.F., Fraga, L.M., Reis, N.J., Faraco, T., Lafon, J.-M., Cordani, U., Wong, T.E.
Published in Geologie en mijnbouw (01.12.2016)

by Hudson, G.A., Milne, F.J., Oliver, N.J., Reis, P., Murray, J. & Meyers, A.M.
Published in South African medical journal (08.09.1979)