1. W. Grimm, Spectrochim. Acta 23B (1968) 443.
2. M. Dogan, K. Laqua, and H. Massman, Spectrochim. Acta 26B (1971) 631.
3. M. Dogan, K. Laqua, and H. Massman, Spectrochim. Acta 26B (1971) 632.
4. H. de La Follie, 8th Spektrometertagung, Linz, 1970.
5. W. Grimm, 8th Spektrometertagung, Linz, 1970.