@article{BesnardSchaub1998,
  author    = {Besnard, Philippe and Schaub, Torsten H.},
  title     = {Characterization of non-monotone non-constructive systems},
  issn      = {1012-2443},
  year      = {1998},
  language  = {en}
}
@article{BesnardSchaub1998,
  author    = {Besnard, Philippe and Schaub, Torsten H.},
  title     = {Signed systems for paraconsistent reasoning},
  year      = {1998},
  language  = {en}
}
@article{BesnardSchaub1998,
  author    = {Besnard, Philippe and Schaub, Torsten H.},
  title     = {Signed systems for paraconsistent reasoning},
  issn      = {0168-7433},
  year      = {1998},
  language  = {en}
}