1. Aboudarham, J. & Fuller, N. (2004). Automatic vs. Manual Detection of Solar Filaments. In Proceedings of the Eighth International Conference on Knowledge-Based Intelligent Information and Engineering Systems, University of Wellington, NZ, Springer (LNAI 3215, Vol. 3: 467?475).
2. Proper motion of solar filaments
3. The Sun's Magnetic Field, 1952-1954.