M. G. Kopylova, R. S. Rickard, A. Kleyenstueber, W. R. Taylor, J. J. Gurney, and L. R. M. Daniels, “The first finding of Cr-Sr-loparite-type and Cr-chevkinite-type minerals in diamonds”, IKC abstracts, vol. 6, no. 1, pp. 292–294, Sep. 1995.