On valuation and optimization problems in fuzzy graphs: A general approach and some particular cases. Delgado, M., Verdegay, L, J., & Vila, M. \ORSA\ Journal on Computing, 2(1):74--83, 1990.
On valuation and optimization problems in fuzzy graphs: A general approach and some particular cases [link]Paper  bibtex   
@article{ delgado_valuation_1990,
  title = {On valuation and optimization problems in fuzzy graphs: A general approach and some particular cases},
  author = {Delgado, Miguel and Verdegay, Jose L and Vila, Maria-Amparo},
  journal = {\{ORSA\} Journal on Computing},
  year = {1990},
  number = {1},
  pages = {74--83},
  volume = {2},
  file = {:C$\backslash$:/Users/virgilio/AppData/Roaming/Zotero/Zotero/Profiles/x4f9hvdg.default/zotero/storage/25I9KT9R/cookieAbsent.html:html},
  shorttitle = {On valuation and optimization problems in fuzzy gr},
  url = {http://pubsonline.informs.org/doi/abs/10.1287/ijoc.2.1.74}
}

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