@article{CMH_1955__29_139109,
     author = {Josef Hersch},
     title = {Longueurs extr\'emales et th\'eorie des fonctions.},
     journal = {Commentarii mathematici Helvetici},
     pages = {301--337},
     publisher = {mathdoc},
     volume = {29},
     year = {1955},
     zbl = {0067.30603},
     url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139109/}
}