A
R. Branco
Polytechnic Institute of Coimbra
J.A.M. Ferreira
University of Coimbra
J.D. Costa
P.N.B. Reis
University of Beira Interior
L. Correia
Instituto Politécnico Nacional
C. Capela
D.M. Rodrigues
L.P. Borrego
A.M. Pereira
Polytechnic Institute of Leiria
P. A. Prates
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