K. Egorov, G. Bogdanov, L. Solovjeva, V. Barankevich, and V. Lipskaya, “Evidence of Magmatism, Matasomatism and Deformation Processes Obtained from the Study of the Unique Compositionally Complex Nodule from the Udachnaya Kimberlite Pipe (Yakutia)”, IKC abstracts, vol. 5, pp. 495–497, Feb. 1991.