1. Reader in Soil Mech., Dept. ofCiv. and Municipal Engrg., Univ. Coli. London, London, England
2. Research Fellow, Dept. of Civ. and Municipal Engrg., Univ. Coli. London, London, England
3. Lect., Dept. of Civ. and Municipal Engrg., Univ. Coli. L ondon, London, England
4. Sr. Engr., Institute Tecnologico Venezolano del Petroleo, Caracas, Venezuela; formerly, Research Student Univ. Coli. London, London, England