Mahotkin, I.L., et al. “Geochemistry and Sr-Nd Isotopic Composition of Kimberlites, Melilitites and Basalts from the Arkhangelsk Region, Russia”. International Kimberlite Conference: Extended Abstracts, vol. 6, no. 1, Sept. 1995, pp. 342-4, doi:10.29173/ikc1886.