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modern cosmology. Thus two major applications are clearly identified: BAO detection, and cosmological parameter constraints using the standard ruler property.  The first convincing detection of BAOs in large-scale structures was reported in the correlation function analysis of the Sloan Digital Sky Survey (SDSS) and   Luminous Red Galaxies (LRG) survey with a 3.4\sigma 3.4$\sigma$  significance. It was followed by other detections, as in the 2-degree Field Galaxy Redshift Survey (2dFGRS), using power spectrum analysis with a 2.5\sigma significance. The power spectrum analysis is also applied with a 3.3\sigma detection in the SDSS-LRG. The combined   power specterum of the LRG and the Main samples of SDSS, together with the 2dFGRS survey, is used to obtain respective significances of 3\sigma and 3.6\sigma. BAO were also detected in the power spectrum of the WiggleZ Dark Energy Survey at a higher redshift z=0.6 with a significance of 3.2\sigma.