So basically, it's "I swiped it from my sister, not you"? Since she didn't attempt to credit said sister in the summary or author's notes. Lovely.

I'm reminded of a case my Dad was in once. The information about his company, which constituted part of the opposition's claims, was dead wrong by a good fifty years. When that little fact was brought up, with accusations of libel, the idiot lawyer in question defended himself with "but I plagiarized it!"