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*http://adsabs.harvard.edu//full/seri/PASP./0072//0000073.000.html
*http://adsabs.harvard.edu//full/seri/BAAS./0029//0001466.000.html
*http://adsabs.harvard.edu//full/seri/JRASC/0090//0000351.000.html
*http://adsabs.harvard.edu//full/seri/PASP./0072//0000073.000.html