1. Allermann, L., Hampe, S., Rau, J.: On rational equivalence in tropical geometry (2014). arXiv:1408.1537 (preprint)
2. Ardila, F., Klivans, C.: The Bergman complex of a matroid and phylogenetic trees. J. Comb. Theory Ser. B. 96, 38–49 (2006). arXiv:math/0311370v2
3. Bertrand, B., Brugallée, E., Mikhalkin, G.: Tropical open Hurwitz numbers. Rend. Semin. Mat. Univ. Padova. 125, 157–171 (2011). arXiv:1005.4628
4. Bertram, A., Cavalieri, R., Markwig, H.: Polynomiality, wall crossings and tropical geometry of rational double hurwitz cycles. JCTA 120, 1604–1631 (2013)
5. Berstein, I., Edmonds, A.L.: On the classification of generic branched coverings of surfaces. Ill. J. Math. 28(1), 64–82 (1984)