@article{10_2307_121074,
     author = {J.C. L\'eger},
     title = {Menger curvature and rectifiability},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {3},
     doi = {10.2307/121074},
     zbl = {0966.28003},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121074/}
}