中国物理快报  2003, Vol. 20 Issue (2): 314-316    
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A Note on the Discovery of Absorption Features in 1E 1207.4-5209
XU Ren-Xin1,2, WANG Hong-Guang2, QIAO Guo-Jun2
1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 2Astronomy Department, School of Physics, Peking University, Beijing 100871
A Note on the Discovery of Absorption Features in 1E 1207.4-5209
XU Ren-Xin1,2;WANG Hong-Guang2;QIAO Guo-Jun2
1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 2Astronomy Department, School of Physics, Peking University, Beijing 100871