1. Thirty Meter Telescope, 2010, http://www.tmt.org/
2. Keck Observatory, 2014, http://www.keckobservatory.org/
3. The European Extremely Large Telescope, 2014, http://www.eso.org/public/teles-instr/e-elt/
4. Shadow imaging of GEO satellites;Burns,2005
5. Shadow imaging efforts at MIT Lincoln Laboratory;Luu,2008