1. Some long-term observation results of artficial lightweight aggregate concrete for structural use in Japan;Ohuchi,1984
2. Lightweight aggregate concrete in Norwegian bridges;Helland;HPC Bridg. Views.,2000
3. S. Helland, Performance of lightweight aggregate concrete in marine environment, Theodore Bremner Symposium on High-performance Lightweight Concrete as a part of the sixth CANMET/ACI international conference on durability of concrete, June. Greece: Edited by John Ries and Thomas Holm, 2003.
4. Service life prediction of LWA concrete in chloride environment, In International symposium structural lightweight aggregate concrete, 20–24 June;Maage,1995
5. T. Hammer, E. Hansen, Water permeability of LWAC, In Second International Symposium on structural lightweight aggregate concrete, 18-22 June. Kristiansand, Norway: Editors: S. Helland et al., 2000.