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Neutral Higgs-boson pair production provides the possibility of studying thetrilinear Higgs couplings at future high-energy colliders. We present the QCDcorrections to the gluon-initiated processes in the limit of a heavy top quarkin the loops and the Drell-Yan-like pair production of scalar and pseudoscalarHiggs particles. The pp cross sections are discussed for LHC energies withinthe Standard Model and its minimal supersymmetric extension. The QCDcorrections are large, enhancing the total cross sections significantly.Comment: 26 pages, latex, 9 ps figure

Neutral Higgs-boson pair production at hadron colliders: QCD corrections