The largest optical interferometers ever to be built on earth are currently under construction in the following projects: centre dot LIGO Project, USA (Barish,1997); centre dot VIRGO Project, Italy/France (Vinet et al. 1997), centre dot GEO 600 Project, Germany/UK (Hough et al. 1997a) centre dot TAMA 300 Project, Japan (Tsubono et al. 1997).
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