This PDF is "A Technical Analysis of What Stuxnet’s Creators Tried to Achieve". 37 pages. 2013.
Related HN discussion about Stuxnet from earlier this week: "The Stuxnet worm may be the most sophisticated software ever written" - https://news.ycombinator.com/item?id=17099969
https://www.youtube.com/watch?v=8Mw1VT3AxHo (starts at 06:45).