1. W. Pauli, Tübingen (Germany), 4.12.1930. W. Pauli, Septieme Conseil de Physique, Solvay 1933, Gauthier-Villars, Paris, 1934.
2. G. Tupper, M. Danos, B. Müller, J. Rafelski, "On the Detection of Cosmic-Background Neutrinos by Acoustic Phonon Scattering", Phys. Rev.D35 (1987) 394.
3. E. Bilpuch, private communication on Michael Danos Symposium, Bad Honnef (Germany), Sept. 2000. The value quoted refers to a proposal for a new site in a salt mine in New Mexico, USA.
4. R. Davis,Phys. Rev. Lett.12 (1964) 303.
5. John Bahcall, private communication.