Tc-dependence of energy gap and asymmetry of coherence peaks in NdBa2Cu3O7- superconductorsP. Das, M. R. Koblischka, Th. Wolf, P. Adelmann and U. HartmannEPL, 84 4 (2008) 47004DOI: https://doi.org/10.1209/0295-5075/84/47004