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Melissa L. Graham; David J. Sand; Dennis Zaritsky; Chris J. Pritchet (13 Μαΐου 2015). «Confirmation of Hostless Type Ia Supernovae Using Hubble Space Telescope Imaging». The Astrophysical Journal807: 83. doi:10.1088/0004-637X/807/1/83. Bibcode: 2015ApJ...807...83G.