Conner JP، Evans WD، Belian RD (سبتمبر 1969). "The Recent Appearance of a New X-Ray Source in the Southern Sky". Astrophys. J. ج. 157: L157–59. Bibcode:1969ApJ...157L.157C. DOI:10.1086/180409.
Conner JP، Evans WD، Belian RD (سبتمبر 1969). "The Recent Appearance of a New X-Ray Source in the Southern Sky". Astrophys. J. ج. 157: L157–59. Bibcode:1969ApJ...157L.157C. DOI:10.1086/180409.