1. Rosen, S. P. in Sixth Workshop on Massive Neutrinos (eds Fackler, O. & Tran Thanh Van) 1–32 (Moriond, 1986).
2. Masiero, A. in Neutrino Telescopes (ed. Baldo Ceolin, M) 187–212 (Universita di Padova, 1988).
3. Langacker, P. in Neutrino Mass and Related Topics (eds Kato, S. & Ohshima, T.) 34–68 (Singapore World Scientific, 1988).
4. Rosen, S. P. & Gelb, J. M. Phys. Rev. D39, 3190–3193 (1989).
5. Wolfenstein, L. in Neutrino Mass and Related Topics (eds Kato, S. & Ohsima, T.) 208–216 (Singapore World Scientific, 1988).