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Poncelet published his theorem ("Poncelet's porism) in 1822, after he returned to France following his captivity as war prisoner in Russia:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1822).

The book has been scanned and can be read here.

Poncelet published his theorem ("Poncelet's porism) in 1822, after he returned to France following his captivity as war prisoner in Russia:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1822).

The book has been scanned and can be read here or on archive.org.

Poncelet published his theorem ("Poncelet's porism) in 1822, after he returned to France following his captivity as war prisoner in Russia:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1922).

The book has been scanned and can be read here.

Poncelet published his theorem ("Poncelet's porism) in 1822, after he returned to France following his captivity as war prisoner in Russia:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1822).

The book has been scanned and can be read here.

Poncelet published it in 1822:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1922).

It has been scanned and can be read here.

Poncelet published his theorem ("Poncelet's porism) in 1822, after he returned to France following his captivity as war prisoner in Russia:

J.V. Poncelet, Traité des propriétés projectives des figures (Paris, 1922).

The book has been scanned and can be read here.