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)
harvard.edu
ui.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)
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)