The puzzles of RX J1856.5-3754: neutron star or quark star?

  title={The puzzles of RX J1856.5-3754: neutron star or quark star?},
  author={Joachim E. Truemper and Vadim Burwitz and Frank Haberl and Vyacheslav E. Zavlin},
  journal={arXiv: Astrophysics},

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