1. Laboratoire de technologie écologique; Institut d'ingénierie de l'environnement, Ecole polytechnique fédérale de Lausanne (EPFL); Station no. 2 CH-1015 Lausanne Switzerland
2. Dep. of Biological and Environmental Engineering; Cornell Univ.; Ithaca NY 14853-5701
3. Soils and Agricultural Engineering Dep.; Paraná State Univ.; Curitiba PR Brazil
4. Civil Construction Dep.; Paraná State Univ.; Curitiba PR Brazil
5. Soil Physics Lab.; CENA/Univ. of Sao Paulo; Piracicaba SP Brazil
6. Dep. of Land, Air and Water Resources; Univ. of California; Davis CA 95616