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  year      = {1997},
  language  = {en}
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  year      = {1998},
  language  = {en}
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@article{HoepfnerHehlBrehmer1999,
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@article{MetzgerChenHoepfneretal.1997,
  author    = {Metzger, Robert M. and Chen, Bo and H{\"o}pfner, Ulf and Lakshmikantham, M. V. and Vuillaume, Dominique and Kawai, Tsuyoshi and Wu, Xiangli and Tachibana, Hiroaki and Hughes, Terry and Sakurai, Hiromi and Baldwin, Jeffrey W. and Hosch, Christina and Cava, Michael P. and Brehmer, Ludwig and Ashwell, Geoffrey J.},
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  year      = {1997},
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}