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Hansen, P., Poggi De Aragão, M., & Ribeiro, C. C. (1991). Hyperbolic 0–1 programming and query optimization in information retrieval. Mathematical Programming, 52(1-3), 255-263. Lien externe
Hansen, P., Poggi De Aragão, M., & Ribeiro, C. C. (1990). Boolean query optimization and the 0-1 hyperbolic sum problem. Annals of Mathematics and Artificial Intelligence, 1(1-4), 97-109. Lien externe