Here is an old Linda Bradford Raschke article where she talks about trading the 20 bar ema. She is the first I read it from some 15 + years ago.
http://www.lbrgroup.com/images///raschke_pt2_0304.pdf
I think we are heading to 79.40-80.50 very soon. Getting short on 1 here at 83.15 with a buck and a half stop initailly. May add closer to 84 or cover sooner or later depending on price action.