+@book{HERMAN80,
+ author = {G.T. Herman},
+ title = {Image Reconstruction from Projections: The Fundamentals of
+ Computerized Tomography},
+ year = {1980},
+ publisher = {Academic Press, New York, 1980}
+}
+
+@book{KAK87,
+ author = {A. Kak and M. Slaney},
+ title = {Principles of Computerized Tomographic Imaging},
+ publisher = {IEEE Press, New York},
+ year = {1987}
+}
+
+@book{PRESS92,
+ author = {W.H. Press, S.A. Teukolsky, W.T. Vellerling, and B.P. Flannery},
+ title = {Numerical Recipes in C: The Art of Scientific Computing},
+ publisher = {Cambridge University Press, Cambridge},
+ edition = {Second},
+ year = {1992}
+}
+
+@article{SHEPP74,
+ author={L. Shepp and B. Logan},
+ title={The fourier reconstruction of a head section},
+ journal = {IEEE Transactions in Nuclear Science},
+ volume = {NS-21},
+ number = {6},
+ pages = {21--43},
+ year = {1974},
+}