An introduction to constraint-based temporal reasoning, 2014, via WWW, Apr. 30, 2014: PDF t.p. (Robert A. Morris, NASA Ames Research Center) p. 107 (senior researcher in Computer Science in the Exploration Technology Directorate, Intelligent Systems Division at NASA Ames Research Center; primary professional goal is the application of advanced AI technology in planning, scheduling, and plan execution to the next generation of NASA's exploration systems)