LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., et al. (2013). A study of the Z production cross-section in pp collisions at root s=7 TeV using tau final states. Journal of high energy physics: JHEP, 2013(1): 111. doi:10.1007/JHEP01(2013)111.