1. “Astrophysical Quantities,”;Allen,1963
2. “Astrophysics—The Atmospheres of the Sun and Stars,”;Aller,1963
3. Emission line ratios in the solar corona;Aly;Ap. J.,1963
4. Coronal ionization by two-step collision processes;Athay;Ap. J.,1963
5. �ber den Mechanismus der Ionisation in der Sonnenkorona