Direct observation of nanometer-scale pinning sites in (Nd0.33Eu0.20Gd0.47)Ba2Cu3O single crystalsP. Das, M. R. Koblischka, S. Turner, G. van Tendeloo, Th. Wolf, M. Jirsa and U. HartmannEPL, 83 3 (2008) 37005DOI: https://doi.org/10.1209/0295-5075/83/37005