Henyey، L. G.؛ Lelevier، R.؛ Levée، R. D. (1955). "The Early Phases of Stellar Evolution". Publications of the Astronomical Society of the Pacific. ج. 67 ع. 396: 154–160. Bibcode:1955PASP...67..154H. DOI:10.1086/126791.
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Henyey، L. G.؛ Lelevier، R.؛ Levée، R. D. (1955). "The Early Phases of Stellar Evolution". Publications of the Astronomical Society of the Pacific. ج. 67 ع. 396: 154–160. Bibcode:1955PASP...67..154H. DOI:10.1086/126791.