Le Duigou, J. -M.; Knödlseder, J. (September 2002), "Characteristics of new star cluster candidates in the Cygnus area", Astronomy and Astrophysics, 392 (3): 869–884, Bibcode:2002A&A...392..869L, doi:10.1051/0004-6361:20020984.
Le Duigou, J. -M.; Knödlseder, J. (September 2002), "Characteristics of new star cluster candidates in the Cygnus area", Astronomy and Astrophysics, 392 (3): 869–884, Bibcode:2002A&A...392..869L, doi:10.1051/0004-6361:20020984.