V. Garanin, S. Anashkin, A. Bovkun, H. Jelsma, I. Shmakov, and K. Garanin, “Groundmass microcrystalline oxides from the Marsfontein pipe (Republic of South Africa), Catoca, Camachia and others Angolan kimberlite pipes”, IKC abstracts, vol. 10, Feb. 2012.