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Published online: 21 February 2015
DOI: 10.1140/epjti/s40485-014-0011-5
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Published online: 30 September 2014
DOI: 10.1140/epjti/s40485-014-0009-z
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Published online: 12 December 2014
DOI: 10.1140/epjti/s40485-014-0010-6