1. C. M. Merrihue, G. Turner, J. Geophys. Res., 71, 2852 (1966)
2. G. Turner, in Meteorite Research ed. P. M. Millman, Reidel Publishing Co., Dordrecht, 407 (1969)
3. G. B. Dalrymple, US Geol. Surv. Bull., 1890, 89 (1989)
4. M. J. Kunk, L. W. Snee, B. M. French, S. S. Harlan, J. J. McGee, Lunar and Planetary Sciences XXIV, Part 1 A-F, Lyndon B. Johnson Space Center, Houston, 835 (1993)
5. J. D. Blum, C. Pege Chamberlain, M. P. Hingston, C. Koeberl, L. E. Marin, B. C. Schuraytz, V. L. Sharpton, Nature, 364, 325 (1993)