Geodesic
General Properties of the Ap Stars
Publications of the Department of Astronomy, Tome 6 (1976) no. 1.

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The general properties (surface temperature, luminosity, rotational velocity, frequency of binaries, atmospherical chemical composition, variability) are summarized, together with the main theories proposed for explaining the phenomenon of the A-type peculiar stars. 
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     author = {Margherita Hack},
     title = {General {Properties} of the {Ap} {Stars}},
     journal = {Publications of the Department of Astronomy},
     pages = {31 - 34},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1976},
     url = {http://geodesic.mathdoc.fr/item/PDA_1976_6_1_a4/}
}
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Margherita Hack. General Properties of the Ap Stars. Publications of the Department of Astronomy, Tome 6 (1976) no. 1. http://geodesic.mathdoc.fr/item/PDA_1976_6_1_a4/