1. Environmental Engineer, Assistant, Faculty of Marine and Environmental Sciences, Univ. of Algarve, Campus de Gambelas, 8000 Faro, Portugal.
2. Civil Engineer, Assistant Professor, Civil Engineer Dept., Univ. of Coimbra, Pinhal de Marrocos, 3030 Coimbra, Portugal.
3. Mining Engineer, Assistant Professor, Instituto Superior Técnico, Lisbon Technical Univ., Av. Rovisco Pais, 1096 Lisboa Codex, Portugal.