Steven D. Peterson, «DOUBLE GALAXIES. I. OBSERVATIONAL DATA ON A WELL-DEFINED SAMPLE», The Astrophysical Journal Supplement Series, vol.40, , p.527-575, 550 (DOI10.1086/190597, Bibcode1979ApJS..40.527P, lire en ligne)
articles.adsabs.harvard.edu
Steven D. Peterson, «DOUBLE GALAXIES. I. OBSERVATIONAL DATA ON A WELL-DEFINED SAMPLE», The Astrophysical Journal Supplement Series, vol.40, , p.527-575, 550 (DOI10.1086/190597, Bibcode1979ApJS..40.527P, lire en ligne)
Steven D. Peterson, «DOUBLE GALAXIES. I. OBSERVATIONAL DATA ON A WELL-DEFINED SAMPLE», The Astrophysical Journal Supplement Series, vol.40, , p.527-575, 550 (DOI10.1086/190597, Bibcode1979ApJS..40.527P, lire en ligne)