@ARTICLE{long:10:3fa,
 author = {Y. Long and J. A. Fessler and J. M. Balter},
 title = {{3D} forward and back-projection for {X-ray} {CT} using separable footprints},
 journal = {{IEEE Trans. Med. Imag.}},
 volume = 29,
 number = 11,
 pages = {{1839--50}},
 month = nov,
 pm = 20529732,
 pmc = 2993760,
 nihmsid = 251837,
 errata = {Ref [37] was NSS-MIC not ISBI. Eqns. (6) and (13) should not have '-'.
Eqns. (33) and (35) may be inaccurate for large cone angles.
},
 doi = {10.1109/TMI.2010.2050898},
 year = 2010
}

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