http://flu.ca/will-the-2013-2014-flu-season-be-worse-than-last-year/?wpmp_switcher=mobile
http://americancountrymd.com/flu-vaccines-fail-the-eldery/
http://www.medicalnewstoday.com/articles/96913.php
https://healthmasters.com/blog/truth-about-flu-shots-do-work
You asked, so there are a few. I work in a large hospital, and this information floats around, with little in the way of documentation available.
Yes, I am aware of how researchers get together and have a group guessing session.