@article{CMH_1978__53_139730,
     author = {George Piranian and Allen Weitsman},
     title = {Level sets of infinite length.},
     journal = {Commentarii mathematici Helvetici},
     pages = {161--164},
     year = {1978},
     volume = {53},
     zbl = {0374.30025},
     url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139730/}
}