1. Anderson, O., Waag, U., Schneider, L., Stephani, G.: Novel metallic hollow sphere structures: processing and properties. In: Banhart, J., Ashby, M.F., Fleck, N.A. (eds.) Metal foams and porous metal structures, pp. 183–188. MIT Publishing, Bremen (1999)
2. Anderson, O., Waag, U., Schneider, L., Stephani, G., Kieback, B.: Novel Metallic Hollow Sphere Strcutures. Adv. Eng. Mater. 2, 192–195 (2000)
3. Ashby, M.F., Evans, A., Fleck, N.A., Gibson, L.J., Hutchinson, J.W., Wadley, H.N.G.: Metal foams: a design guide. Butterworth-Heinemann, Boston (2000)
4. Baumeister, E., Klaeger, S., Kaldos, A.: Lightweight, hollow-sphere-composite (HSC) materials for mechanical engineering applications. J. Mater. Process Tech., 155-156, 1839–1846 (2004)
5. Bonino, J.P., Rousset, A., Rossignol, C., Blottière, Y.: Composite material with hollow spherical modules made of microcrystallized or amorphus nickel alloys (in French). Matér. Tech. 78, 25–28 (1990)