Megacrysts from Griba kimberlite pipe (Arkhangelsk Province) - Kostrovitsky, S.I.; Verichev, E.M.; Garanin, V.K.; Suvorova, L.V.; Aschepkov, I.V.; Malkovets, V.; Griffin, W.L. (International Kimberlite Conference: Extended Abstracts, 2003)