@article{JEMS_2009_11_5_a2,
     author = {Piermarco Cannarsa and Yifeng Yu},
     title = {Singular {Dynamics} for {Semiconcave} {Functions}},
     journal = {Journal of the European Mathematical Society},
     pages = {999--1024},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {2009},
     doi = {10.4171/jems/173},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/173/}
}