Magnetic properties of C-doped Zn12O12 clusters: First-principles study Q. J. Wang, J. B. Wang, X. L. Zhong, Q. H. Tan and Y. C. Zhou EPL, 95 4 (2011) 47010 Published online: 29 July 2011 DOI: 10.1209/0295-5075/95/47010