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http://dx.doi.org/10.1016/j.ecss.2011.12.016http://dx.doi.org/10.1016/j.ecss.2011.12.016http://dx.doi.org/10.1016/j.ecss.2011.12.016http://www.elsevier.com/locate/ecsshttp://www.sciencedirect.com/science/journal/02727714mailto:lillebo@ci.uc.ptmailto:lillebo@ua.pt

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