1. Aardsma, G. et al., 1987, Phys. Lett. B 194, 321.
2. Ahlen, S.P., et al., 1987, Phys. Lett. B 195, 603.
3. Alcock, C. and E. Farhi, 1985, Phys. Rev. D32, 1273.
4. Auriemma, G., et al., 1985, INFN (Rome) Report no. 447.
5. Avignone, F.T., et al., 1987, Phys. Rev. B35, 2752.