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Fernando Galván, José Francisco and Ruiz Sancho, J. M. and Scheiderer, Claus (2006) Sums of squares of linear forms. Mathematical Research Letters, 13 (5-6). pp. 947-956. ISSN 1073-2780
Andradas Heranz, Carlos and Ruiz Sancho, J. M. (1994) Ubiquity of Lojasiewicz’s example of a nonbasic semialgebraic set. Michigan Mathematical Journal, 41 (3). pp. 465-472. ISSN 0026-2285