Gang Shi Arye Nehorai A Relationship Between Time-Reversal Imaging and Maximum-Likelihood Scattering Estimation. 4707-4711 2007 55 IEEE Transactions on Signal Processing 9 http://doi.ieeecomputersociety.org/10.1109/TSP.2007.896244 db/journals/tsp/tsp55.html#ShiN07a