W. Baade, « No. 600. The absolute photographic magnitude of supernovae. », Contributions from the Mount Wilson Observatory / Carnegie Institution of Washington, vol. 600, , p. 1-20 (Bibcode1938CMWCI.600....1B, lire en ligne [PDF])
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W. Baade, « No. 600. The absolute photographic magnitude of supernovae. », Contributions from the Mount Wilson Observatory / Carnegie Institution of Washington, vol. 600, , p. 1-20 (Bibcode1938CMWCI.600....1B, lire en ligne [PDF])