Helmut A. Abt, Nidia I. Morrell. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars. „Astrophysical Journal Supplement”. 99, s. 135, 1995. DOI: 10.1086/192182. Bibcode: 1995ApJS...99..135A. (ang.).
Helmut A. Abt, Daryl W. Willmarth. Binaries in the Praesepe and Coma Star Clusters and Their Implications for Binary Evolution. „Astrophysical Journal”. 521, s. 682-690, 1999. DOI: 10.1086/307569. Bibcode: 1999ApJ...521..682A. (ang.).
Helmut A. Abt, Nidia I. Morrell. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars. „Astrophysical Journal Supplement”. 99, s. 135, 1995. DOI: 10.1086/192182. Bibcode: 1995ApJS...99..135A. (ang.).
Helmut A. Abt, Daryl W. Willmarth. Binaries in the Praesepe and Coma Star Clusters and Their Implications for Binary Evolution. „Astrophysical Journal”. 521, s. 682-690, 1999. DOI: 10.1086/307569. Bibcode: 1999ApJ...521..682A. (ang.).
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