El Halconazo (The Corpus Christi Massacre)

I was in Mexico City during this event (el Halconazo) on a trip with my junior high school spanish class however I never learned much about what actually happened. I do remember the little tanks driving down the street in front of our hotel and the sound of machine gun fire in the distance.

I am interested in learning more about what the students wanted to accomplish, how they were organized, who backed them, and what results they managed to achieve. I've read this Mexico's 1971 Corpus Christi Massacre, Fifty Years Late but am interested in other resources with more information about the student's side of the conflict.