Biancalani, A., Bottino, A., Ehrlacher, C., Grandgirard, V., Merlo, G., Novikau, I., et al. (2017). Cross-code gyrokinetic verification and benchmark on the linear collisionless dynamics of the geodesic acoustic mode. Physics of Plasmas, 24: 062512. doi:10.1063/1.4985571.