@ARTICLE {33121,
author={L.M. Távora},
doi={10.1109/23.682689},
journal={IEEE Transactions on Nuclear Science},
title={One-sided imaging of large, dense objects using 511-keV photons from induced-pair production},
year={1998},
month={June},
volume={45},
number={3},
pages={970-975},
ISSN={0018-9499}
}