Alloy nanowires: Invar inside carbon nanotubes - Grobert, N; Mayne, M; Terrones, M; Sloan, J; Dunin-Borkowski, R; Kamalakaran, R; Seeger, T; Terrones, H; Ruhle, M; Walton, D; Kroto, H; Hutchison, J (CHEMICAL COMMUNICATIONS, 2001)