Some of the work referenced on this page was supported in part by the National Science Foundation under grant numbers PHY-2309186, PHY-1912584, PHY-1505875, PHY-1308325, PHY-0856050, PHY-0556292, PHY-0070981, PHY-9800971, PHY-9512686, PHY-0601550, and PHY-0801368. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF). |