Quotes, snippets, and citations are the downfall of Panda. What Panda should do, is allow for linked citations, and disregard copied text- however, instead, Panda slams your website for collating and commenting on the others content. Apparently the whole academic model of stylized writing was forgotten the moment Google engineers got their degrees.
Anyhow, the answer seems to be parse and replace for non-registered and bots, till Google gets its groove back. (Oops, did I write that out loud?)