1. 1) Jim Kindinger: Light weight structural core, ASM Handbook, Vol.21 (2001) 180-183.
2. 2) Anthony G. Evans, John W. Hutchinson and Michael F. Ashby: Current Opinion in Solid State & Materials Science 3 (1998) 288-303.
3. 3) A.M. Hayes, D.L. McDowell and J.K. Cochran, Jr: Proceedings of the 2002 TMS Annual Meeting in Seattle. Washington, Processing and Properties of Lightweight Cellular Metals and Structures, (2002) pp.223-232.
4. 4) J.L. Clark, J.K. Cochran, T.H. Sanders, K.J. Lee: Proceedings of the 2002 TMS Annual Meeting in Seattle, Washington, Processing and Properties of Lightweight Cellular Metals and Structures, (2002) pp.137-146.
5. 5) H. Kanahashi, T. Mukai, Y. Yamada, K. Shimojima, M. Mabuchi, T. Aizawa and K. Higashi: Mater. Trans. 42 (2001) 2087-2092.