Publication - Journal Article Hidden ferromagnetic secondary phases in cobalt-doped ZnO epitaxial thin films DOI https://doi.org/10.1103/physrevb.77.201303 Journal Article Physical Review B, vol. 77, iss. 20, 2008 Authors T. C. Kaspar, T. Droubay, S. M. Heald, M. H. Engelhard, P. Nachimuthu, S. A. Chambers Language English