@article(2004-a-memoizing-semantics-for-functional-logic-languages,
  author = {Salvador España Boquera and V. Estruch},
  title = {A Memoizing Semantics for Functional Logic Languages},
  year = {2004},
  journal = {Lecture Notes in Computer Science},
  volume = {2986},
  pages = {109-123}
)