@Book{Borys.1990b,
  author = {Borys, Bernd-Burkhard and Sundstr{\"o}m, G. A. and Fejes, Lajos and Str{\"a}tz, Gerd},
  title  = {The intelligent graphical editor with design support and user model (IGE3): ESPRIT-GRADIENT Report P857-WP11-UKS 059},

  year   = {1990},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{Borys.1990b,
  author = {Borys, Bernd-Burkhard and Sundström, G. A. and Fejes, Lajos and Strätz, Gerd},
  title  = {The intelligent graphical editor with design support and user model (IGE3): ESPRIT-GRADIENT Report P857-WP11-UKS 059},

  year   = {1990},
  number = {},
  url    = {},

  const  = {\ text}
}