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Pardalos, Panos M.; Vavasis, Stephen A. (1991). "Quadratic programming with one negative eigenvalue is (strongly) NP-hard". Journal of Global Optimization. 1 (1): 15–22. doi:10.1007/bf00120662. S2CID12602885.
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Gould, Nicholas I. M.; Hribar, Mary E.; Nocedal, Jorge (April 2001). "On the Solution of Equality Constrained Quadratic Programming Problems Arising in Optimization". SIAM J. Sci. Comput. 23 (4): 1376–1395. CiteSeerX10.1.1.129.7555. doi:10.1137/S1064827598345667.
Pardalos, Panos M.; Vavasis, Stephen A. (1991). "Quadratic programming with one negative eigenvalue is (strongly) NP-hard". Journal of Global Optimization. 1 (1): 15–22. doi:10.1007/bf00120662. S2CID12602885.