% Not in the source data: doi, abstract, number
@article{mula-2007-material-requirement-planning,
  author = {{J. Mula} and {R. Poler} and {J.P. Garcia-Sabater}},
  title = {{Material Requirement Planning with fuzzy constraints and fuzzy coefficients}},
  journal = {Fuzzy Sets and Systems},
  year = {2007},
  volume = {158},
  pages = {783--793}
}