The following publications are possibly variants of this publication:
- On Copositive Programming and Standard Quadratic Optimization ProblemsImmanuel M. Bomze, Mirjam Dür, Etienne de Klerk, Cornelis Roos, Arie J. Quist, Tamás Terlaky. jgo, 18(4):301-320, 2000. [doi]
- Using copositivity for global optimality criteria in concave quadratic programming problemsGabriele Danninger, Immanuel M. Bomze. mp, 62:575-580, 1993.