Cordes، J. M.؛ Romani، R. W.؛ Lundgren، S. C. (1993). "The Guitar nebula: A bow shock from a slow-spin, high-velocity neutron star". Nature. ج. 362 ع. 6416: 133. Bibcode:1993Natur.362..133C. DOI:10.1038/362133a0.
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Cordes، J. M.؛ Romani، R. W.؛ Lundgren، S. C. (1993). "The Guitar nebula: A bow shock from a slow-spin, high-velocity neutron star". Nature. ج. 362 ع. 6416: 133. Bibcode:1993Natur.362..133C. DOI:10.1038/362133a0.