This site describes soft gamma repeaters. Here the author explains how these strange, physically-extreme stars form, and why they emit steadily pulsating X-rays with sporadic, bright outbursts. The author also tells the story of their discovery and of the theoretical efforts which helped to reveal their bizarre nature.
Duncan, Robert C.. 'Magnetars', soft gamma repeaters and very strong magnetic fields. April 1, 2003. http://solomon.as.utexas.edu/~duncan/magnetar.html#Strong_Magnetic_Fields (accessed 14 August 2018).
%0 Electronic Source %A Duncan, Robert C. %D April 1, 2003 %T 'Magnetars', soft gamma repeaters and very strong magnetic fields %V 2018 %N 14 August 2018 %8 April 1, 2003 %9 text/html %U http://solomon.as.utexas.edu/~duncan/magnetar.html#Strong_Magnetic_Fields
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