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The isolated neutron star X-ray pulsars RX J0420.0–5022 and RX J0806.4–4123 : new X-ray and optical observations
Haberl, F..  Astronomy & Astrophysics.  v. Vol.424. no. No.2.   2004-09. p. 635 - 645... issn: 0004-6361 .   

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