1. Avrett, E. H. 1981, in The Physics of Sunspots, ed. L. E. Cram, & J. H. Thomas (Sacramento, CA: AURA), 253
2. The chromosphere above a sunspot umbra
3. Gros, M., Tatischeff, V., Kiener, J., et al. 2004, in The INTEGRAL Universe, Proc. 5th INTEGRAL Workshop, ESA SP-552, ed. V. Schönfelder, G. Lichti, & C. Winkler (Noordwijk: ESA), 669
4. Radiation environment along the INTEGRAL orbit measured
with the IREM monitor
5. Deexcitation gamma-ray line emission from solar flare magnetic loops