VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'Embedded young stellar object candidates in the active star-forming complex W51: mass function and spatial distribution.' (bibcode: 2009ApJ...706...83K)
Kang, M. (Creator), Bieging, J. H. (Creator), Povich, M. S. (Creator), Lee, Y. (Creator) (2012). Embedded YSO candidates in W51. Centre de Donnees Strasbourg (CDS). 10.26093/cds/vizier.17060083