1. G.P. Felcher, R.T. Kampwirth, K.E. Gray and R. Felici, Phys.Rev.Lett., 52, 1539 (1984).
2. M. Russa, J. Low Temp. Phys., 50, 301 (1983).
3. D.A. Komeev, V.V. Pasyuk, A.V. Petrenko and E.B. Dokukin, “Neutron reflectivity studies on superconducting, magnetic and absorbing thin films on the polarized neutron spectrometer at the pulsed reactor IBR-2”, (see this issue).
4. D.A. Korneev and L.P. Chernenko, JINR Rapid Communication 4[30]-88 and Poverhnost. Fizika, himija, mehanika. 9, 61 (1990) (in russian).