This paper was published in: Physics of semiconductors 2002 : proceedings of the 26th International Conference on the Physics of Semiconductors held in Edinburgh, UK, 29 July-2 August 2002 / edited by A.R. Long and J.H. Davies, published by Institute of Physics, 2003. It is available from http://www.iop.org/Conferences/Conference%20Proceedings/index.htmlMetadata only entr
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