http://jb.utad.pt/
http://www.sciencedirect.com/science/article/pii/S0308814611002810
http://www.hindawi.com/journals/bmri/2014/814590/
http://www.sciencedirect.com/science/article/pii/S092666901400274X
http://link.springer.com/article/10.1007/s12161-012-9548-6
http://www.sciencedirect.com/science/article/pii/S0926669012005882
A.M. Carvalho
http://www.sciencedirect.com/science/article/pii/S1756464614003958
http://fst.sagepub.com/content/18/3/281.short
http://link.springer.com/article/10.1007/s10722-011-9726-1
http://www.sciencedirect.com/science/article/pii/S0926669014007985
http://onlinelibrary.wiley.com/doi/10.1002/ptr.3284/full
http://onlinelibrary.wiley.com/doi/10.1002/ptr.3366/full
http://www.sciencedirect.com/science/article/pii/S0278691509003305
http://www.sciencedirect.com/science/article/pii/S0023643810000150
www.flora-on.pt
http://www.sciencedirect.com/science/article/pii/S092666901400627X
http://www.sciencedirect.com/science/article/pii/S002364381500050X