AG (Algebraic geometry)
Pure
Panchishkin: Motives for Absolute Hodge Cycles (in Motives volumes)
See also the notion of motivic cycles, in André chapters 9 and 10.
arXiv:1101.3647 Notes on absolute Hodge classes from arXiv Front: math.AG by François Charles, Christian Schnell We survey the theory of absolute Hodge classes. The notes include a full proof of Deligne’s theorem on absolute Hodge classes on abelian varieties as well as a discussion of other topics, such as the field of definition of Hodge loci and the Kuga-Satake construction.
Deligne: Hodge cycles on abelian varieties (notes by Milne), 1982, in LNM900. Om Milne’s webpage??
nLab page on Motives for absolute Hodge cycles