1. P. Duwez and H. E. Martens: The Powder Metallurgy of Porous Metals and Alloys Having a Controlled Porosity. AIME Metals Tech. Apr. 1948, TP 2343.
2. W. D. Jones: Principles of Powder Metallurgy. Edward Arnold and Co., London (1937).
3. F. N. Rhines: Metals Tech. Aug. 1946, TP 2043; Trans. AIME (1946) 166, 474.
4. A. J. Shaler and J. Wulff: Ind. Eng. Chem. (May 1948) 40, 838.
5. A. A. Noyes and M. S. Sherrill: A Course of Study in Chemical Principles. 1938. New York. The Macmillan Co.