Pairing symmetry in the iron-pnictide superconductor KFe2As2 Wei Li, Jian Li, Jian-Xin Zhu, Yan Chen and C. S. Ting EPL, 99 5 (2012) 57006 Published online: 13 September 2012 DOI: 10.1209/0295-5075/99/57006