It is a nice article.

Haga's theorem are there,http://www.origami.gr.jp/Archives/People/CAGE_/divide/02-e.html Mathematics of paper folding,http://en.wikipedia.org/wiki/Mathematics_of_paper_folding#cite_note-12

Haga's book, we can get by Amazon, ORIGAMICS: MATHEMATICAL EXPOLORATIONS THROUGH PAPER FOLDING

## Haga's Book

It is a nice article.

Haga's theorem are there,

http://www.origami.gr.jp/Archives/People/CAGE_/divide/02-e.html

Mathematics of paper folding,

http://en.wikipedia.org/wiki/Mathematics_of_paper_folding#cite_note-12

Haga's book, we can get by Amazon,

ORIGAMICS: MATHEMATICAL EXPOLORATIONS THROUGH PAPER FOLDING