The unravel tool is described in a two volume technical report (NISTIR 5691) is available by anonymous ftp. The first volume covers the requirements, design and evaluation of unravel while the second volume is an unravel user manual.
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Unravel Obtaining the Unravel source code
Download Unravel source code as a compresed (.Z) file.
The unravel team consisted of:
Dolores R. Wallace
David W. Binkley