@article{Vai:00,
  journal = {J.UCS},
  volume = {6},
  title = {Notes on partially-ordered structures in computer science. {I}.
           {PA}-ordered semirings and some related structures},
  year = {2000},
  fjournal = {J.UCS. The Journal of Universal Computer Science},
  pages = {201--211 (electronic)},
  number = {1},
  author = {Vaida, Drago{\c{s}}},
}