@MISC{zheng:17:pua-arxiv,
 author = {X. Zheng and S. Ravishankar and Y. Long and J. A. Fessler},
 title = {{PWLS-ULTRA:} {An} efficient clustering and learning-based approach for low-dose {3D} {CT} image reconstruction},
 url = {http://arxiv.org/abs/1703.09165},
 year = 2017
}

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