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harvard.edu
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Joshua Cooper, Chris Poirel. Pythagorean Partition-Regularity and Ordered Triple Systems with the Sum Property. — 2008. — Т. 0809. — С. 3478. — Bibcode: 2008arXiv0809.3478C. — arXiv:0809.3478.
web.archive.org
Keith Conrad. The congruent number problem // Harvard College Mathematical Review. — 2008. — Т. 2, вып. 2. — С. 58–73. Архивировано 20 января 2013 года.