1. S. Akiyama, H. Ueno, K. Imagawa, A. Kitahara, S. Nagata, K. Morimoto, T. Nishikawa,M. Itoh, US Pat. 4713277 (1987).
2. B.C. Alien, M.W. Mote, A.M. Sabroff, US Pat. 3087807 (1963).
3. ALPORAS® brochure, (1998), Shinko Wire Co., Ltd., Amagasaki-shi, Japan.
4. Manufacturing of Aluminum Foams from PMMC Melts Material Characteristics and Typical Properties in Metal Foams;Åsholt,1997
5. J. Babjak, V.A. Ettel, V. Paserin, US Pat. 4957543 (1990).