1. Several authors:Härterei-Tech. Mitt., special edition: Spannungsermittlung mit Röntgenstrahlen, 1976, vol. 31, nos. 1 and 2, pp. 1-124.
2. B. Syren, H. Wohlfahrt, and E. Macherauch:Arch. Eisenhüttenwes., 1977, vol. 48, pp. 421–26.
3. G. Faninger and H. Walburger:Härterei-Tech. Min., 1976, vol. 31, pp. 79–82.
4. P.D. Evenschor and V. Hauk:Z. Metallkde., 1975, vol. 66, pp. 167–68.
5. H. Dölle and V. Hauk:Härterei-Tech. Mitt., 1976, vol. 31, pp. 165–68.