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APA Citation
Simm, T., Buchner, J., Merloni, A., Nandra, K., Shen, Y., Erben, T., Coil, A. L., Willmer, C. N. A., & Schneider, D. P. (2018). dramatic X-ray spectral variability of a Compton-thick type-1 QSO at z ∼ 1. Monthly notices of the Royal Astronomical Society, 480(4), 4912–4917. http://access.bl.uk/ark:/81055/vdc_100095503446.0x000049