VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'PC 1643+4631A,B: the Lyman-{alpha} forest at the edge of coherence.' (bibcode: 2008AJ....136..181C)
Casey, C. M. (Creator), Impey, C. D. (Creator), Petry, C. E. (Creator), Marble, A. R. (Creator), Dave, R. (Contributor) (2011). Spectroscopy of PC 1643+4631A,B. Centre de Donnees Strasbourg (CDS). 10.26093/cds/vizier.51360181