Model-based estimation with boundary side information or boundary regularization. Chiao, P. C., Rogers, W. L., Fessler, J. A., Clinthorne, N. H., & Hero, A. O. IEEE Trans. Med. Imag., 13(2):227–34, June, 1994.
doi  bibtex   
@ARTICLE{chiao:94:mbe-2,
 author = {P. C. Chiao and W. L. Rogers and J. A. Fessler and N. H. Clinthorne and A. O. Hero},
 title = {Model-based estimation with boundary side information or boundary regularization},
 journal = {{IEEE Trans. Med. Imag.}},
 volume = 13,
 number = 2,
 pages = {{227--34}},
 month = jun,
 doi = {10.1109/42.293915},
 year = 1994
}

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