1. J. Weber, in:First Edoardo Amaldi Conference on Gravitational Wave Experiments, E. Coccia, G. Pizzella, and F. Ronga (eds.), World Scientific, River Edge, N.J. (1995), p. 416.
2. E. Amaldi et al.,Europhys. Lett.,3, 1325 (1987).
3. E. Amaldi et al., in:Supernova 1987A in the Large Magellanic Cloud, M. Kafatos and A. Michalitsianos (eds.), Cambridge Univ. Press, Cambridge (1987), p. 453.
4. D. Morrison,Usp. Fiz. Nauk,156, 719 (1988).
5. V. S. Imshenik and D. K. Nadezhin,Itogo Nauki Tekh., Astron.,21, 63 (1982).