Terence Tao wrote an exposition of Ricci flow with surgery in: Tao, Terence (2006). «Perelman's proof of the Poincaré conjecture: a nonlinear PDE perspective».
Bing, RH (1958). «Necessary and sufficient conditions that a 3-manifold be S3». Annals of Mathematics. Second Series68 (1): 17–37. doi:10.2307/1970041.