1. Assoc. Prof., Ctr. for Soft Ground Engrg., Dept. of Civ. Engrg., Nat. Univ. of Singapore, Singapore 117576.
2. Prof., Ctr. for Soft Ground Engrg., Dept. of Civ. Engrg., Nat. Univ. of Singapore, Singapore 117576.
3. Prof. Ofcr., Dept. of Civ. Engrg., Nat. Univ. of Singapore, Singapore 117576.