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(en) Paul W. Merrill, « Periods and Lights-Ranges of Long-Period Variable Stars », Astrophysical Journal, vol. 131, , p. 385 (DOI10.1086/146841, Bibcode1960ApJ...131..385M)
(en) I. Soszyński, A. Udalski, M. K. Szymański, M. Kubiak, G. Pietrzyński, Ł. Wyrzykowski, O. Szewczyk, K. Ulaczyk et R. Poleski, « The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. IV. Long-Period Variables in the Large Magellanic Cloud », Acta Astronomica, vol. 59, , p. 239 (Bibcode2009AcA....59..239S, arXiv0910.1354)
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