@booklet {6815,
	title = {ANDRADE, M. de 1954. Contribution a l{\textquoteright}etude des roches alcalines d{\textquoteright}Angola (note preliminaire). 19th International Geological Congress, Algiers. Comptes Rendus, 19: 241-52.MACHADO, F.J. de S. 1958. The volcanic belt of Angola and its carbonatites. Publicat},
	year = {1954},
	note = {ANDRADE, M. de 1954. Contribution {\`a} l{\textquoteright}{\'e}tude des roches alcalines d{\textquoteright}Angola (note preliminaire). 19th International Geological Congress, Algiers. Comptes Rendus, 19: 241-52.MACHADO, F.J. de S. 1958. The volcanic belt of Angola and its carbonatites. Publication. Commission for Technical Cooperation in Africa South of the Sahara. Joint Meeting, Leopoldville, 44: 309-17.}
}
