Deep-seated xenoliths, xenocrysts in kimberlites and crystalline inclusions in diamonds from "Udachnaya" kimberlite pipe, Yakutia - Sobolev, N.V.; Pokhilenko, N.P.; Lavrent'ev, Yu.G.; Yefimova, E.S. (International Kimberlite Conference: Extended Abstracts, 1977)