Aggarwal, K M & Keenan, F P 2008, ' Energy levels, radiative rates, and electron impact excitation rates for transitions in OVII ', Astronomy and Astrophysics, vol. 489, pp. 1377-1388 . https://doi.org/10.1051/0004-6361:200810531
Keenan, F P, Drake, J J & Aggarwal, K M 2007, ' An investigation of Fe XVI emission lines in solar and stellar extreme-ultraviolet and soft X-ray spectra ' Monthly Notices of the Royal Astronomical Society, vol. 381, pp. 1727-1732 . https://doi.org/10.1111/j.1365-2966.2007.12365.x
Aggarwal, K M, Keenan, F P & Msezane, A Z 2007, ' Energy levels and radiative rates for transitions in Co XI ', Astronomy and Astrophysics, vol. 473, pp. 995-1003 . https://doi.org/10.1051/0004-6361:20078017