1. A. Rockmore and A. Macovski. A maximum likelihood approach to transmission image reconstruction from projections. IEEE Trans. Nuc. Sci. 1929–1935, 1977.
2. L.A. Shepp and Y. Vardi. Maximum likelihood reconstruction in positron emission tomography. IEEE Trans. Med. Imaging 113–122, 1982.
3. K. Lange and R. Carson. Em reconstruction algorithms for emission and transmission tomography. J. Comp. Assist. Tomo 306–316, 1984.
4. G.H. Golub and C.F. Van Loan. Matrix Computations. John Hopkins University Press, Baltimore, Maryland, 1985.
5. S. Kawata and O. Nalcioglu. Constrained iterative reconstruction by the conjugate gradient method. IEEE Trans. Med. Imaging 65–71, 1985.