@ARTICLE{fessler:99:cgp,
 author = {J. A. Fessler and S. D. Booth},
 title = {Conjugate-gradient preconditioning methods for shift-variant {PET} image reconstruction},
 journal = {{IEEE Trans. Im. Proc.}},
 volume = 8,
 number = 5,
 pages = {{688--99}},
 month = may,
 doi = {10.1109/83.760336},
 year = 1999
}

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