Tardos, Gábor (1995-03-01). "Transversals of 2-intervals, a topological approach". Combinatorica. 15 (1): 123–134. doi:10.1007/bf01294464. ISSN 0209-9683. https://dx.doi.org/10.1007/bf01294464
Tardos, Gábor (1995-03-01). "Transversals of 2-intervals, a topological approach". Combinatorica. 15 (1): 123–134. doi:10.1007/bf01294464. ISSN 0209-9683. https://dx.doi.org/10.1007/bf01294464
Kaiser, T. (1997-09-01). "Transversals of d-Intervals". Discrete & Computational Geometry. 18 (2): 195–203. doi:10.1007/PL00009315. ISSN 1432-0444. https://doi.org/10.1007/PL00009315
Frick, Florian; Zerbib, Shira (2019-06-01). "Colorful Coverings of Polytopes and Piercing Numbers of Colorful d-Intervals". Combinatorica. 39 (3): 627–637. arXiv:1710.07722. doi:10.1007/s00493-018-3891-1. ISSN 1439-6912. https://doi.org/10.1007/s00493-018-3891-1