@InProceedings{CFL09concur,
  author      = {Wojciech Czerwi{\'n}ski and Sibylle Fr{\"o}schle and S{\l}awomir Lasota},
  title       = {Partially-commutative context-free processes},
  booktitle   = {Proc. CONCUR'09},
  year        = 2009,
  volume      = 5710,
  pages       = {259--273},
  series      = {LNCS},
  publisher   = {Springer-Verlag}
}