Reference for Cochran-Orr-Teichner's filtrations on knot concordance
There are summarys of parts of Cochran, Teichner and Orr's paper in:
- These lecture notes of Peter Teichner, typed up by Julia Collins and Mark Powell;
- Mark Powell's 2011 Edinburgh PhD thesis;
- Julia Collins' 2012 Edinburgh PhD thesis.
You'll find all of these references (and I'm sure more besides) at Andrew Ranicki's webpage.
Disclaimer: I'm not a geometric topologist, but as I was in Edinburgh around the time I ended up as one of the examiners of Julia Collins' thesis.