Håstad, Johan (1989), "Almost Optimal Lower Bounds for Small Depth Circuits", in Micali, Silvio (ed.), Randomness and Computation(PDF), Advances in Computing Research, vol. 5, JAI Press, pp. 6–20, ISBN0-89232-896-7, archived from the original(PDF) on 2012-02-22
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Håstad, Johan (1989), "Almost Optimal Lower Bounds for Small Depth Circuits", in Micali, Silvio (ed.), Randomness and Computation(PDF), Advances in Computing Research, vol. 5, JAI Press, pp. 6–20, ISBN0-89232-896-7, archived from the original(PDF) on 2012-02-22