PhysOrg. Retrieved 2009-12-30. Cite web URL http://www.physorg.com/news146398685.html Title How Time-Traveling Could Affect Quantum Computing Last name Lisa Zyga Source date 2008-11-20 Website [[PhysOrg]] URL access date 2009-12-30 ↑ John Watrous at the Mathematics Genealogy Project. ↑ John Watrous at the Institute for Quantum Computing directory.