Literature

• Observation of the impulsive phase of a simple flare, Tandberg-Hanssen et al., 1984, Solar Physics, Volume 90, Issue 1, pp.41-62, pdf
• Broadening of soft X-ray lines during the impulsive phase of solar flares - Random or directed mass motions? , Doyle, J. G.; Bentley, R. D., 1986, Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 278-282., pdf