These source files were obtained from JVOIPLIB 1.4.1. The original
README is the following:

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These sources are derived from the work done by Jutta Degener and Carsten
Bormann at the Technical University of Berlin. These sources are modified
and files were left out of the original package.

You can find the original implementation at the following URL:
http://kbs.cs.tu-berlin.de/~jutta/toast.html

