@article{journals/tse/CeriG85,
  title = "Translating SQL Into Relational Algebra: Optimization, Semantics, and Equivalence of SQL Queries",
  author = "Stefano Ceri and Georg Gottlob",
  year = "1985",
  journal = "{IEEE Trans. Software Eng.}",
  number = "4",
  pages = "324-345",
  volume = "11",
}