Upper critical field in : Magnetotransport vs. magnetotunneling P. Samuely, P. Szabó, T. Klein, A. G. M. Jansen, J. Marcus, C. Escribe-Filippini and P. Wyder Europhys. Lett., 41 2 (1998) 207-212 Published online: 01 September 2002 DOI: 10.1209/epl/i1998-00132-1