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Lower bounds for pinning lines by balls Cheong, Otfried; Goaoc, Xavier; Holmsen, Andreas, European Conference on Combinatorics, Graph Theory and Applications, pp.567 - 571, 2009-09-11 |
Lower bounds to Helly numbers of line transversals to disjoint congruent balls Cheong, Otfried; Goaoc, Xavier; Holmsen, Andreas, ISRAEL JOURNAL OF MATHEMATICS, v.190, no.1, pp.213 - 228, 2012-08 |
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