Beche, J.F.; Byrd, J.M.; Chow, K.; Denes, P.; Ghiorso, W.; Matis,H.S. et al. Rad-hard Luminosity Monitoring for the LHC, article, June 24, 2007; (https://digital.library.unt.edu/ark:/67531/metadc901784/m1/1/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .