1. Y. Zhang, Y. Tavrin, H.J. Krause, H. Bousack, A.I.B. Ai, U. Kalberkamp, U. Matzander, M. Burghoff, L. Trahms, Appl. Supercond. 3, 367 (1995)
2. H. Becker, Archaeol. Prosp. 2, 217 (1995)
3. Magnetism in Medicine, edited by W. Andrä, H. Nowak (Wiley-VCH, Berlin, 1998)
4. I.S. Altarev, Y.V. Borisov, N.V. Borovikova, A.I. Egorov, S.N. Ivanov, E.A. Kolomensky, M.S. Lasakov, V.M. Lobashev, V.A. Nazarenko, A.N. Pirozhkov, et al., Phys. At. Nucl. 59, 1152 (1996)
5. URL http://ucn.web.psi.ch/ (2005)