http://www.ibtimes.co.uk/chinese-su-27-warplane-intercepts-us-navys-p-8-poseidon-1462320
http://foxtrotalpha.jalopnik.com/chinese-su-27-fighter-jet-did-a-barrel-roll-over-a-usn-1625759458
http://theaviationist.com/2014/08/22/chinese-su-27-jet-threatened-u-s-surveillance-aircraft-with-a-barrel-roll-stunt-over-the-top-of-it/
http://foxtrotalpha.jalopnik.com/chinese-su-27-fighter-jet-did-a-barrel-roll-over-a-usn-1625759458
http://theaviationist.com/2014/08/22/chinese-su-27-jet-threatened-u-s-surveillance-aircraft-with-a-barrel-roll-stunt-over-the-top-of-it/