1. W·H. Otte, D.B. O’Donnell, S.D. Kiser and C·W. Cox 1996 Welding Low Thermal Expansion Alloys for Aircraft Composite Tooling. Weld. J., 75(7), 51-55
2. C. E. Witherell 1964 Welding Nickel-Iron Alloys of the Invar Type, Weld. J., 43(4), 161 s-169 s
3. T. Gottlieb, and C·S. Shira (1965) Fabrication of Iron-Nickel Alloys for Cryogenic Piping Service. Weld. J., 44(3), 116 s-123 s
4. T. Ogawa (1986) Weldability of Invar and Its Large-Diameter Pipe. Weld. J. 65(8), 213 s-226 s
5. W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Templesmith, and C.J. Dawes, Friction Stir Butt Welding, International Patent App. No. PCT/GB92/02203 and GB Patent App. No. 9125978.8, December 1991, U.S. Patent No. 5,460,317, October 1995