Some articles on wigderson:

Pseudorandom Generators and Derandomization - Pseudorandom Generators For Polynomial Time
... In 1991, Noam Nisan and Avi Wigderson provided a candidate pseudorandom generator with these properties ... In 1997 Russell Impagliazzo and Avi Wigderson proved that the construction of Nisan and Wigderson is a pseudorandom generator assuming that there exists ...