APA (7th ed.) Citation

Levi, G., & Sirovich, F. (1973). Some remarks on the equivalence between and / or graphs and context-free grammars.

Chicago Style (17th ed.) Citation

Levi, Giorgio, and Franco Sirovich. Some Remarks on the Equivalence Between and / or Graphs and Context-free Grammars. Pisa, 1973.

MLA (9th ed.) Citation

Levi, Giorgio, and Franco Sirovich. Some Remarks on the Equivalence Between and / or Graphs and Context-free Grammars. 1973.