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References
- ↑ Choquet, Gustave (1966), "3. Upper and lower envelopes of a family of functions", Topology, Academic Press, pp. 129–131, ISBN 9780080873312
- ↑ Boissonnat, Jean-Daniel; Yvinec, Mariette (1998), "15.3.2 Computing the lower envelope", Algorithmic Geometry , Cambridge University Press, p. 358, ISBN 9780521565295
- ↑ Choquet (1966), p. 136.