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2. http://www.ifg.tu-clausthal.de/java/seis/seisdoc-e.html.
3. Modern Approaches in Geophysics of Poles and Zeros Fundamentals of Digital Seismology;Frank,2001
4. Modern Control Engineering;Katsuhiko,1997
5. http://www.geophys.uni-ststuttgart.de/oldwww/seismometry/man_html/node10. html.