Forman, W.; Kellogg, E.; Gursky, H.; Tananbaum, H.; Giacconi, R. (1972). "Observations of the Extended X-Ray Sources in the Perseus and Coma Clusters from UHURU". Astrophysical Journal. NASA/IPAC Extragalactic Database. 178: 309–316. Bibcode:1972ApJ...178..309F. doi:10.1086/151791. S2CID120168704.
Forman, W.; Kellogg, E.; Gursky, H.; Tananbaum, H.; Giacconi, R. (1972). "Observations of the Extended X-Ray Sources in the Perseus and Coma Clusters from UHURU". Astrophysical Journal. NASA/IPAC Extragalactic Database. 178: 309–316. Bibcode:1972ApJ...178..309F. doi:10.1086/151791. S2CID120168704.
Forman, W.; Kellogg, E.; Gursky, H.; Tananbaum, H.; Giacconi, R. (1972). "Observations of the Extended X-Ray Sources in the Perseus and Coma Clusters from UHURU". Astrophysical Journal. NASA/IPAC Extragalactic Database. 178: 309–316. Bibcode:1972ApJ...178..309F. doi:10.1086/151791. S2CID120168704.