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(en) M. Ammler-von Eiff et A. Reiners, « New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? », Astronomy & Astrophysics, vol. 542, , article no A116 (DOI10.1051/0004-6361/201118724, Bibcode2012A&A...542A.116A, arXiv1204.2459)