Altered former alkali carbonatite lava from Oldoinyo Lengai, Tanzania: Inferences for calcite carbonatite lavas,
Dawson, J. B., M. S. Garson, B. Roberts (1987) (1987),
Geology, 15, 8 p. 765–768,
10.1130/0091-7613(1987)15%3C765:AFACLF%3E2.0.CO;2.