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We present numerical examples with nontrapping, trapping, and piecewise smooth speeds, as well as examples with data on a part of the boundary. These numerical examples demonstrate the robust performance of the Neumann series\u2013based algorithm.<\/jats:p>","DOI":"10.1137\/100817280","type":"journal-article","created":{"date-parts":[[2011,9,16]],"date-time":"2011-09-16T02:23:43Z","timestamp":1316139823000},"page":"850-883","source":"Crossref","is-referenced-by-count":86,"title":["An Efficient Neumann Series\u2013Based Algorithm for Thermoacoustic and Photoacoustic Tomography with Variable Sound Speed"],"prefix":"10.1137","volume":"4","author":[{"given":"Jianliang","family":"Qian","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Plamen","family":"Stefanov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gunther","family":"Uhlmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongkai","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2011,9,15]]},"reference":[{"key":"R1","doi-asserted-by":"crossref","unstructured":"M. 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