1. Geological Inst., Univ. of Tuebingen, Sigwartstr. 10, D-72076, Germany; formerly, Geotech. Dept., São Paulo Univ., Brazil. E-mail: sayonara.brederode@uni-tuebingen.de
2. Assoc. Prof., Geotech. Dept., São Paulo Univ., Av. Dr. Carlos Botelho, 1465; Cx. P. 359-CEP. 13560-970, São Carlos, SP, Brazil. E-mail: lazarus1@sc.usp.br
3. Prof., Geological Inst., Univ. of Tuebingen, Sigwartstr. 10, D-72076, Germany. E-mail: peter.grathwohl@uni-tuebingen.de