@article{GDZPPN002062860, title = {Level sets of infinite length.}, journal = {Commentarii mathematici Helvetici}, volume = {53}, year = {1978}, pages = {161-164}, zbl = {0374.30025}, url = {http://dml.mathdoc.fr/item/GDZPPN002062860} }
Piranian, George; Weitsman, Allen. Level sets of infinite length.. Commentarii mathematici Helvetici, Tome 53 (1978) pp. 161-164. http://gdmltest.u-ga.fr/item/GDZPPN002062860/