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On the computational complexity of the order polynomial Faigle, Ulrich. - Bonn : Sonderforschungsbereich 303, Information u.d. Koordination Wirtschaftl. Aktivitäten, 1985
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Undecidable versus difficult to decide Börger, Egon. - Dortmund : Univ., Abt. Informatik, 1983
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The computational complexity of logical theories Ferrante, Jeanne. - Berlin, Heidelberg, New York : Springer, 1979
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On the computational complexity of integer programming problems Kannan, Ravindran. - Bonn : Inst. für Ökonometrie und Operations-Research, 1977
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