1. W.J. Kroll, Ductile chromium and its alloys, in: Proceedings of the Conference Office of Ordnance Research, American Society for Metals, 1955, p. 4.
2. T.E. Teietz, J.W. Wilson, Behavior and Properties of Refractory Metals, Tokyo University International Edition No. 6, University of Tokyo Press, 1965, p. 40.
3. D.J. Maykuth, A. Gilbert, Chromium and Chromium Alloys, Defense Metals Information Center (DMIC) Report 234, 1966.
4. J.R. Stephens, W.D. Klopp, Ductility Mechanisms and Superplasticity in Chromium Alloys, National Aeronauics and Administration (NASA) Report TN D-4346, 1968.