The time constant vanishes only on the percolation cone in directed first passage percolation.
Zhang, Yu
Electronic Communications in Probability [electronic only], Tome 14 (2009), p. 2264-2286 / Harvested from The Electronic Library of Mathematics
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Publié le : 2009-01-01
EUDML-ID : urn:eudml:doc:225815 
@article{05636648,
     title = {The time constant vanishes only on the percolation cone in directed first passage percolation.},
     journal = {Electronic Communications in Probability [electronic only]},
     volume = {14},
     year = {2009},
     pages = {2264-2286},
     zbl = {1192.60109},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05636648}
}

Zhang, Yu. The time constant vanishes only on the percolation cone in directed first passage percolation.. Electronic Communications in Probability [electronic only], Tome 14 (2009) pp. 2264-2286. http://gdmltest.u-ga.fr/item/05636648/