@article{10_2307_2661371,
     author = {F. Reese Harvey and H. Blaine Lawson jun.},
     title = {Finite volume flows and {Morse} theory},
     journal = {Annals of mathematics},
     year = {2001},
     volume = {153},
     number = {1},
     doi = {10.2307/2661371},
     zbl = {1001.58005},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/2661371/}
}