Magnetar
Ibrahim, A. I., H. Anwer, M. H. Soliman, N. Mackie-Jones, K. S. Dhuga, W. C. Parke, and J. H. Swank,
"On the iron interpretation of the 6.4 keV emission line from SGR 1900+14",
Astrophysics and Space Science, vol. 308, issue 1-4, pp. 535-539, 2007.