1. The W.M. Keck telescope segmented primary mirror active control system,;Jared,1990
2. Technical specification for the manufacturing and delivery of prototype position actuators for the primary mirror of the European Extremely Large Telescope (E-ELT),;Erm,2009
3. Control analysis of the TMT primary segment assembly,;Thompson,2008
4. [Signal Processing for Active Control];Elliot,2001
5. A filter apparatus for actively reducing noise.;Berkhoff,7 June 2007