Mixed order parameter symmetries in cuprate superconductors A. Bussmann-Holder, R. Khasanov, A. Shengelaya, A. Maisuradze, F. La Mattina, H. Keller and K. A. Müller EPL, 77 2 (2007) 27002 Published online: 05 January 2007 DOI: 10.1209/0295-5075/77/27002