@article{ASNSP_2002_5_1_1_33_0,
     author = {Cerf, Rapha\"el},
     title = {The {Hausdorff} lower semicontinuous envelope of the length in the plane},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {33--71},
     publisher = {Scuola normale superiore},
     volume = {Ser. 5, 1},
     number = {1},
     year = {2002},
     mrnumber = {1994801},
     zbl = {1047.28001},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_2002_5_1_1_33_0/}
}