@article{GDZPPN00235487X, title = {The Iversen theorem in a polydisc.}, journal = {Mathematica Scandinavica}, volume = {43}, year = {1978}, pages = {64-70}, zbl = {0399.32004}, url = {http://dml.mathdoc.fr/item/GDZPPN00235487X} }
Childress, C.L.; Csordas, G.L. The Iversen theorem in a polydisc.. Mathematica Scandinavica, Tome 43 (1978) pp. 64-70. http://gdmltest.u-ga.fr/item/GDZPPN00235487X/