@article{BaierLimaNetoWipperetal.1996,
  author    = {Baier, Frank W. and Lima-Neto, G. B. and Wipper, H. and Braun, Michael},
  title     = {Optical and X-ray structures of galaxy clusters I},
  year      = {1996},
  language  = {en}
}
@article{BaierLimaNetoWipper1996,
  author    = {Baier, Frank W. and Lima-Neto, G. B. and Wipper, H.},
  title     = {Comparison between optical and X-ray structures of galaxy clusters},
  year      = {1996},
  language  = {en}
}