**Author details**

Bruno B. Garcia, Gonçalo Lourinho, Paulo Brito\* and Pedro Romano VALORIZA—Research Center for Endogenous Resource Valorization, Portalegre, Portugal

\*Address all correspondence to: pbrito@ipportalegre.pt

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
