00485nas a2200073   4500008003900000245026000039210006900299856004300368       1991                          d00aISSA, A., DOS SANTOS, A.B.R.M.D., RIFFEL, B.F., LAPIDO-LOUREIRO, F.E.V. and MCREATH, I. 1991. Aspects of the geology, petrology and chemistry of some Angolan carbonatites. Journal of Geochemical Exploration, 40: 205-26.LAPIDO-LOUREIRO, F.E. 1973. Carbonat0 aISSA A DOS SANTOS ABRMD RIFFEL BF LAPIDOLOUREIRO FEV and MCREATH  uhttps://alkcarb.myrocks.info/node/6845