Gowers norm

Volume 5, Article 3 (pages 69-82)
Unconditional Pseudorandom Generators for Low Degree Polynomials
by Shachar Lovett
Volume 4, Article 7 (pages 137-168)
Norms, XOR Lemmas, and Lower Bounds for Polynomials and Protocols
by Emanuele Viola and Avi Wigderson