Omer Reingold Luca Trevisan Madhur Tulsiani Salil P. Vadhan Dense Subsets of Pseudorandom Sets. 2008 15 Electronic Colloquium on Computational Complexity (ECCC) http://eccc.hpi-web.de/eccc-reports/2008/TR08-045/index.html 045 db/journals/eccc/eccc15.html#ReingoldTTV08