@article{RudVai:04,
  journal = {Fund. Inform.},
  volume = {61},
  title = {Semirings in operations research and computer science: more algebra},
  year = {2004},
  fjournal = {Fundamenta Informaticae},
  pages = {61--85},
  number = {1},
  author = {Rudeanu, Sergiu and Vaida, Drago{\c{s}}},
}