@article {doi:10.1137/100801433,
	title = {Optimal Transport with Branching Distance Costs and the Obstacle Problem},
	journal = {SIAM Journal on Mathematical Analysis},
	volume = {44},
	number = {1},
	year = {2012},
	pages = {454-482},
	doi = {10.1137/100801433},
	url = {https://doi.org/10.1137/100801433},
	author = {Fabio Cavalletti}
}
