J. Billam
- The use of permeable materials for backfilling trenches. Dans: Proceedings of the Institution of Civil Engineers - Transport, v. 141, n. 3 (août 2000). (2000):
- Use of Pulverized Fuel Ash in Trench Backfill. Dans: Journal of Materials in Civil Engineering (ASCE), v. 12, n. 3 (août 2000). (2000):