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WikiPedia: TON_618 http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://adsabs.harvard.edu/cgi-bin/bib_query?1970A%... http://articles.adsabs.harvard.edu/cgi-bin/nph-iar... http://www.astroscu.unam.mx/bott/BOTT..2-16/PDF/BO... //arxiv.org/abs/astro-ph/0406559 //arxiv.org/abs/astro-ph/9911476 //doi.org/10.1086%2F182182 //doi.org/10.1086%2F308704 //doi.org/10.1086%2F423607 http://iopscience.iop.org/article/10.1086/308704/p...