@article{10_4171_ifb_160,
     author = {Filippo Santambrogio},
     title = {Optimal channel networks, landscape function and branched transport},
     journal = {Interfaces and free boundaries},
     pages = {149--169},
     year = {2007},
     volume = {9},
     number = {1},
     doi = {10.4171/ifb/160},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/160/}
}