1. General Alloy Analysis with a Gas Sheathed Tubular Electrode Arc
2. Annual Book of ASTM Standards, Part 32 (American Society for Testing and Materials, Philadelphia, Pa., 1970), Standard E101–67, p. 474.
3. Murphy J. F. and Mortensen G. F., in Methods for Emission Spectrochemical Analysis (American Society for Testing and Materials, Philadelphia, Pa., 1971), E-2 SM 7–14, 6th ed., p. 698.