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(98) See, for example, four papers by Baade, , Minkowski, , Aller, and Greenstein, in Ap. J.119, no. 1, 1954, and several papers by Shklovsky in recent issues of Astr. J. U.S.S.R.Google Scholar
(99)
(99)Morgan, W. W. and Blaauw, A., Ap. J.119, 625, 1954.Google Scholar