1. Enrique Gonzalez-Jimenez and Xavier Guitart, On the modularity level of modular abelian varieties over number fields, J. Number Theory 130 (2010), no. 7, 1560–1570.[arXiv]
  2. Xavier Guitart and Jordi Quer, Modular abelian varieties over number fields, preprint (2009), 24 pages.[arXiv]