N. M. Zobachev
- The use of ultrasonics for determining soil density. Dans: Soil Mechanics and Foundation Engineering, v. 6, n. 2 (mars 1969). (1969):
- Influence of compaction and density on the mechanical properties of loose soils. Dans: Soil Mechanics and Foundation Engineering, v. 6, n. 6 (novembre 1969). (1969):