@article{1029002616,
author = {Belna, Charles and Cohn, William and Piranian, George and Stephenson, Kenneth},
title = {Level-sets of special Blaschke products.},
journal = {Michigan Math. J.},
volume = {29},
number = {1},
year = {1982},
pages = { 79-81},
language = {en},
url = {http://dml.mathdoc.fr/item/1029002616}
}
Belna, Charles; Cohn, William; Piranian, George; Stephenson, Kenneth. Level-sets of special Blaschke products.. Michigan Math. J., Tome 29 (1982) no. 1, pp. 79-81. http://gdmltest.u-ga.fr/item/1029002616/