Henry Gordon Rice (1953). "Classes of Recursively Enumerable Sets and Their Decision Problems". Transactions of the American Mathematical Society. American Mathematical Society. ج. 74 ع. 2: 358–366. DOI:10.2307/1990888. JSTOR:1990888.
Henry Gordon Rice (1953). "Classes of Recursively Enumerable Sets and Their Decision Problems". Transactions of the American Mathematical Society. American Mathematical Society. ج. 74 ع. 2: 358–366. DOI:10.2307/1990888. JSTOR:1990888.
مُعرِّف موقع "عالَم الرياضيات"(MathWorld): topics/TheoryofComputation. الاقتباس: Discrete Mathematics > Computer Science > Theory of Computation. الوصول: 12 يونيو 2018.