Szepietowski99'

BibTeX

@article{DBLP:journals/ita/Szepietowski99,
  author    = {Andrzej Szepietowski},
  title     = {There is no complete axiom system for shuffle expressions},
  journal   = {ITA},
  volume    = {33},
  number    = {3},
  year      = {1999},
  pages     = {271-278},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}