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Knebusch, Manfred and Choi, Man-Duen and Lam, Tsit-Yuen and Reznick, Bruce (1982) Transversal zeros and positive semidefinite forms. In: Géométrie algébrique réelle et formes quadratiques. Lecture Notes in Mathematics, 959. Springer, Berlin, pp. 273-298. ISBN 978-3-540-11959-3.