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The website can be found at https://debyeusersystem.github.io
See J. Appl. Cryst (2010) 43, 1543-1547 and J. Appl. Cryst. (2015) 48, 2026-2032 for references.
The source code of the program can be found here.
We recommend you to install the binaries found here.
For instructions to install the program suite please check the file Programs_Installation_64bit_Windows.pdf.