@article{LehmannHasingerGiacconietal.2000,
  author    = {Ingo Lehmann and G{\"u}nther Hasinger and R. Giacconi and J. E. Gunn and M. Schmidt and D. P. Schneider and Thomas Stanke and J. Tr{\"u}mper and Joachim Wambsganß and D. Woods and G. Zamorani},
  title     = {One of the highest redshift X-Ray selected clusters of galaxies},
  year      = {2000},
}