Trabajo presentado al 22nd PATMOS celebrado en Newcastle del 4 al 6 de septirmbre de 2012.
The different versions of the original document can be found in:
Published on 01/01/2013
Volume 2013, 2013
DOI: 10.1007/978-3-642-36157-9_17
Licence: CC BY-NC-SA license
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