EntityQ1499325· pop 18· linked from 14 articlesGreibach normal formSign in to saveform for context-free grammarsConnectionsterminal and nonterminal symbolsEntityInternational Standard Book NumberEntitydigital object identifierEntityformal languageEntityBackus–Naur formEntityQ22908627Entitycontext-free grammarEntitypushdown automatonEntityChomsky normal formEntityempty stringEntityCiteSeerXEntitycontext-free languageEntitytop-down parsingEntityKuroda normal formEntitySheila GreibachEntityleft recursionEntityproductionEntityCategoriesFormal languages