1. Study of the atmospheric neutrino flux in the multi-GeV energy range, The Super-Kamiokande Collaboration, hep-ex/9805006, May 1998.
2. Evidence for oscillation of atmospheric neutrinos, The Super-Kamiokande Collaboration, hep-ex/9807003, July 1998.
3. V. Barger, T.J. Weiler, K. Whisnant, hep-ph/9807319; G.L. Fogli, E. Lisi, A. Marrone, G. Scioscia, hep-ph/9808205.
4. G.K. Leontaris, S. Lola, G. Ross, Nucl. Phys. B 454 (1995) 25, hep-ph/9505402; K.S. Babu, J.C. Pati, F. Wilczek Link between Neutrino Masses, Super-Kamiokande Result and Proton Decay, to appear.