Temperature dependence of the YBa2Cu3O7 energy gap in differently oriented tunnel junctions F. Giubileo, A. Jossa, F. Bobba, A. I. Akimenko and A. M. Cucolo Eur. Phys. J. B, 24 3 (2001) 305-308 Published online: 15 December 2001 DOI: 10.1007/s10051-001-8678-1