1. Professor, Civil Engineering School, A Coruña Univ., Campus de Elviña, s/n, 15912 A Coruña, Spain.
2. CITEEC, A Coruña Univ., Campus de Elviña, s/n, 15912 A Coruña, Spain.
3. Associate Professor, EPS, Santiago de Compostela Univ., Bernardino Pardo Ouro, s/n, 27002 Lugo, Spain.