### Selected papers, and one very old manuscript.

(For published papers, the version posted here includes final
corrections made by the author(s), but not corrections made in proof.)

Some of the work reported here was partially supported by the NSF under grant DMS-1009194. Any opinions, findings, and conclusions
or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National
Science Foundation.

- Transmission eigenvalues and
thermoacoustic tomography, (With K. Hickmann), published
in Inverse
Problems, 29 , article id
104016, 2013: journal site
- Range
conditions for a spherical mean transform. (With
M. Agranovsky and P. Kuchment) Inverse Problems and Imaging,3, pp. 373-382, 2009
- The
spherical mean value operator with centers on a sphere.
(With Rakesh) Inverse Problems, 23, no. 6, pp. S37-S49, 2007.
- Inversion of
spherical means and the wave equation in even dimension.
(With M. Haltmeier and Rakesh) SIAM J. Appl. Math., vol. 68, no. 3, pp.
392-412, 2007
- The range
of the spherical mean value operator for functions supported in a
ball. (With Rakesh) Inverse Problems, 22, pp. 923-938, 2006.
- Trace
identities for solutions of the wave equation with initial data supported in
a ball. (With Rakesh) Math. Meth. Appl. Sci., 18, pp. 1897-1917, 2005.
- Determining
a function from its mean values over spheres. (With
S. K. Patch and Rakesh) SIAM J. Math. Analysis, 35, pp. 1213-1240, 2004.
- Microlocal analysis of the x-ray transform
with sources on a curve. (With Ih-Ren Lan and Gunther
Uhlmann) pp. 193-218 in Inside Out, Camb. U. Press, 2003.
- The
attenuated x-ray transform: recent developments. pp. 47-66
in Inside Out, Camb. U. Press, 2003.

- The
X-ray transform for a non-abelian connection. (With Gunther Uhlmann) Inverse
Problems, 17 (2001) , pp.
695-701.
- Approximate
reconstruction formulae for the cone beam transform I (an
unpublished manuscript from 1987).