1. Charters, A. C. and Summers, J. L.: 1959, ‘Some Comments on the Phenomena of High Speed Impact’, NOLR 1238, U.S. Naval Ordnance Laboratory, White Oak, Silver Springs, Md., pp. 200–221.
2. Comerford, M. F.: 1967,Geochim. Cosmochim. Acta 31, 1457–1471.
3. Gault, D. E., Shoemaker, E. M., and Moore, H. J.: 1963, ‘Spray Ejected from the Lunar Surface by Meteoroid Impact’, NASA TN D-1767.
4. Gault, D. E. and Heitowit, E. D.: 1963,Proc. 7th Hypervel. Impact Symp. 2, pp. 419–456.
5. Gault, D. E.: 1969, Abstract inMeteoritics 4, No. 3.