Yerkes Astrophysics Academy for Young Scientists (YAAYS) Hubble data-mining project 10 April 2007 by Vivian Hoette and Max Mutchler.
Yerkes Astrophysics Academy for Young Scientists (YAAYS) Summer Institute 2007 Hubble data-mining project: The Ring Nebula M57 Vivian Hoette and Max Mutchler.