1. Burmistrov, M. P., V. V. Nedler u.S. P. Polyakova: Zavodskaja Laborat.30(6), 694 (1964).
2. Fratkin, Z. G.: Zavodskaja Laborat.26, 971 (1960).
3. Gerbatsch, R., u.H. Scholze: Jenaer Rundschau8, 89 (1963).
4. Hansen, G.: Optik1, 227 (1946),2, 155 (1947).
5. Harvey, C. E.: A method of semi-quantitative spectrographic analysis. Glendale, Calif. 1947.