@article{10_4153_CJM_2011_080_6,
     author = {McCann, Robert J. and Pass, Brendan and Warren, Micah},
     title = {Rectifiability of {Optimal} {Transportation} {Plans}},
     journal = {Canadian journal of mathematics},
     pages = {924--934},
     year = {2012},
     volume = {64},
     number = {4},
     doi = {10.4153/CJM-2011-080-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2011-080-6/}
}