@Article{ng1990,
  Title                    = {Uncertainty management in expert systems},
  Author                   = {K. C. Ng and B. Abramson},
  Journal                  = ieeee,
  Year                     = {1990},
  Pages                    = {29-48},
  Volume                   = {5},

  Claves                   = {,prob,l-dif,dem-sha,fc,}
}