1. An extended discussiom of the work presented in this paper is given in: H.F.C. Hoevers, P.J.M. van Bentum, L.E.C. van der Leemput, H. van Kempen, A.J.G. Schellingerhout and D. van der Marel, to be published in the first issue of Physica C.
2. A.J.G. Schellingerhout, R.H.M. van de Leur, D. Schalkoord, D. van der Marel and J.E. Mooij, Z. Phys. B, to be published.
3. Angular relation and energy dependence of Andreev reflection