J. Quer, THE BRAUER CLASS OF THE ENDOMORPHISM ALGEBRA OF A MODULAR ABELIAN VARIETY, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 327(3), 1998, pp. 227-230
A formula is given for the Brauer class of the endomorphism algebra Q
x End(A(f)) of the abelian variety A(f)/Q attached by Shimura to a new
form f is an element of S-2 (N, epsilon) as a product of quaternion a
lgebras and a term coming from the character epsilon. (C) Academie des
Sciences/Elsevier, Paris