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(en) Edward Pigott et Henry C. Englefield, « On the Periodical Changes of Brightness of Two Fixed Stars. By Edward Pigott, Esq. Communicated by Sir Henry C. Englefield, Bart. F. R. S », The Royal Society, vol. 87, , p. 133–141 (DOI10.1098/rstl.1797.0007, JSTOR106921, Bibcode1797RSPT...87..133P)