Dr David Flater,
Dr Philippe Martin and
Michelle L. Crane (2007).
Rendering UML Activity Diagrams as Human-Readable Text.
NISTIR report 7469, National Institute of Standards and Technology, Gaithersburg, MD, 2007.
HTML version: on the NIST site,
on this site.
PDF version: on the NIST site, on this site.
List of the recent NIST publications (including this one).