@article{10_4064_aa153_1_1,
     author = {Xavier Guitart},
     title = {Fields of definition of building blocks
 with quaternionic multiplication},
     journal = {Acta Arithmetica},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {153},
     number = {1},
     year = {2012},
     doi = {10.4064/aa153-1-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa153-1-1/}
}