@article{00918329,
title = {On the non-convexity of the time constant in first-passage percolation.},
journal = {Electronic Communications in Probability [electronic only]},
volume = {1},
year = {1996},
pages = {1-6},
zbl = {0866.60087},
language = {en},
url = {http://dml.mathdoc.fr/item/00918329}
}
Kesten, Harry. On the non-convexity of the time constant in first-passage percolation.. Electronic Communications in Probability [electronic only], Tome 1 (1996) pp. 1-6. http://gdmltest.u-ga.fr/item/00918329/