Grew, E.S. and Hazen, R.M. (2013) Evolution of the minerals of beryllium. Stein (Norwegian journal for amateur mineralogists), Special Issue for Roy Kristiansen 70 years, 4-19.
Mayewski, P.A., Meeker, L.D., Whitlow, S., Twickler, M.S., Morrison, M.C., Alley, R.B., Bloomfield, P. and Taylor, K., 1993, The atmosphere during the Younger Dryas, Science 261: 195-197.