1. “Cosmical Electrodynamics,”;Alfvén,1958
2. The meaning of chromospheric turbulance and the UV excess of the sun;Biermann;Naturwisschschaften,1946
3. �ber den Mechanismus der Ionisation in der Sonnenkorona
4. Comet tails and solar corpuscular radiation;Biermann;Z. Ap.,1951
5. The shape of coronal line profiles;Billings;Ap. J.,1964