1. 1) K. Abiko: phys. status solidi (a), 160 (1997), 285–296.
2. 2) Japanese Industrial Standards Committee: Iron and steel–Methods for Determination of Sulfur Content, JIS G1215, Japanese Standards Association, 1994, pp. 15–26 (in Japanese).
3. 3) idem: General Rules for Determination of Sulfur in Metallic Materials, JIS Z2616, Japan. Standard Association,1996, pp. 14–17 (in Japanese).
4. 4) D. Lawrenz: phys. status solidi (a), 167 (1998), 373–381.
5. 5) The same reference to (2), pp. 27–37.