Investigating the Nature of Absorption Lines in the Chandra X-Ray Spectra of the Neutron Star Binary 4U 1820-30DOI: info:10.1086/529483v. 6771233–1240
Cackett, E. M., Miller, J. M., Raymond, J., Homan, J., van der Klis, M., Méndez, M., Steeghs, D., and Wijnands, R. 2008. "Investigating the Nature of Absorption Lines in the Chandra X-Ray Spectra of the Neutron Star Binary 4U 1820-30." The Astrophysical Journal, 677 1233–1240. https://doi.org/10.1086/529483.