@article{PPN35397434X_0061+dmdlog5, title = {Two-sheeted coverings of the disc.}, journal = {Mathematica Scandinavica}, volume = {61}, year = {1987}, pages = {17-38}, zbl = {0663.30042}, url = {http://dml.mathdoc.fr/item/PPN35397434X_0061+dmdlog5} }
Forelli, Frank. Two-sheeted coverings of the disc.. Mathematica Scandinavica, Tome 61 (1987) pp. 17-38. http://gdmltest.u-ga.fr/item/PPN35397434X_0061+dmdlog5/