@ARTICLE{AlGG09,
author={X. Allamigeon and S. Gaubert and E. Goubault},
title={Computing the Vertices of Tropical Polyhedra using Directed Hypergraphs},
journal={Discrete Comp. Geom.},
doi={10.1007/s00454-012-9469-6}, 
eprint={0904.3436v3},
year=2013,
volume=49,
number=2,
pages={247-279},
}