1. J. Kurtz, in Proceedings of the 2nd Annual Spring Meeting, p. 40, Metal Powder Association, New York (1946).
2. C. Agte and J. Vacet, Tungsten and Molybdenum NASA Technical Trans., Washington, DC (1963) (English Translation).
3. J. H. Brophy, L. A. Shepard, J. Wulff, and W. Leszynski, ed., p. 113, Interscience, New York, (1961).