1. http://www.ualberta.ca/∼droles/aviation/concord3.html
2. https://www.google.bg/?gfe_rd=cr&ei=YSV3U7eIIenc8gfmloD4Bg#q=tu+144
3. https://www.google.bg/search, British_Airways_Helicopters_S-61_G-ATFM.jpg
4. Recent development in aluminium alloys for aerospace applications;Heinz;Mater. Sci. Eng. A,2000
5. Application of Modern Aluminum Alloys to Aircraft;Starke;Prog. Aerospace Sci.,1996