Varilly-Alvarado, AnthonyViray, Bianca2014-04-142014-04-142014Varilly-Alvarado, Anthony and Viray, Bianca. "Arithmetic of del Pezzo surfaces of degree 4 and vertical Brauer groups." <i>Advances in Mathematics,</i> 255, (2014) Elsevier: 153-181. http://dx.doi.org/10.1016/j.aim.2014.01.004.https://hdl.handle.net/1911/75887engThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.Journal articlehttp://dx.doi.org/10.1016/j.aim.2014.01.004