Andrade X, Alberdi-Rodriguez J, Strubbe DA, Oliveira MJ, Nogueira F, Castro A, Muguerza J, Arruabarrena A, Louie SG, Aspuru-Guzik A an, et al. Time-dependent density-functional theory in massively parallel computer architectures: the octopus project. Journal of Physics: Condensed Matter. 2012;24(23):233202.