by Heleno da Silva, S.I.N., Day, S.J., Fonseca, J.F.B.D.
Published in Journal of volcanology and geothermal research (01.12.1999)

by Heleno, S.I.N., Frischknecht, C., d’Oreye, N., Lima, J.N.P., Faria, B., Wall, R., Kervyn, F.
Published in Journal of African earth sciences (1994) (01.12.2010)

by Day, S.J., Heleno da Silva, S.I.N., Fonseca, J.F.B.D.
Published in Journal of volcanology and geothermal research (01.12.1999)