1. Barsukov, V. L., Tarasov, L. S., Dmitriev, L. V., Kolesov, G. M., Shevaleesky, I. D., and Gardmin, A. V.: 1977,Proc. Lunar Sci. Conf. 8th, pp. 3319?3332.
2. Bhandari, N., Padia, J. T., Potdar, M. B., and Shah, V. G.: 1977, in papers presented to the Conf. on Luna-24, Lunar Science Institute, Houston, Texas pp. 25?27.
3. Bhai, N. B., Gopalan, K., Goswami, J. N., Rao, M. N., and Venkatesan, T. R.: 1978,Proc. Lunar and Planet. Sci. Conf. 9th (in press).
4. Bogard, D. D. and Hirsch, W. C.: 1978, Proc. of the Luna-24, Vol.Mare Crisium: The View from Luna-24, pp. 311?322.
5. Eberhardt, P., Geiss, J., Graf, H., Grogler, N., Mendia, M. D., Morgeli, M., Schwaller, H., Stettler, A., Krahenbuhl, U., and Von Gunten, H. R.: 1972,Proc. Lunar. Sci. Conf. 3rd, pp. 1821?1856.