@inproceedings{paper76,
  title = "What are the fundamental structures of concurrency? We still don't know!",
  author = "S. Abramsky",
  year = "2005",
  booktitle = "Algebraic process calculi: the first 25 years and beyond",
  month = "June",
  pages = "1-5",
  series = "{BRICS} Notes Series NS-05-03",
}