The reference details

Parmanand Sharma, Amita Gupta, K. V. Rao, Frank J. Owens, Renu Sharma, Rajeev Ahuja, J.M. Osorio Guillen, Börje Johansson, G. A. Gehring, "Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO", Nature Materials 2, 673 (2003): on-line

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