@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/