Unique Paper Identifier (UPI) or Timed Document ID (TDID)
This title can be used as the unique identifier. A number + name ID must be assigned by the authors.
It is simply the string of year, month, day, hour, name of the uploader/author, and location.
For example: 2011.11.04.01.24.JongBhak.
See also
http://jongbhak.com/index.php/Timed_Document_ID
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