@article{Knuth68,
  title = {Semantics of Context-Free Languages},
  author = {Donald E. Knuth},
  year = {1968},
  url = {http://www.springerlink.com/content/m2501m07m4666813/},
  tags = {programming languages, semantics, rule-based, attribute grammars, formal semantics, context free languages, rules, e-science, programming, context-aware, grammar},
  researchr = {https://researchr.org/publication/Knuth68},
  cites = {0},
  citedby = {1},
  journal = {Theory Comput. Syst.},
  volume = {2},
  number = {2},
  pages = {127-145},
}