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@article{MS2_1978__42_166576, author = {C.L. Childress and G.L. Csordas}, title = {The {Iversen} theorem in a polydisc.}, journal = {Mathematica Scandinavica}, pages = {64--70}, publisher = {mathdoc}, volume = {42}, year = {1978}, zbl = {0399.32004}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__42_166576/} }
C.L. Childress; G.L. Csordas. The Iversen theorem in a polydisc.. Mathematica Scandinavica, Tome 42 (1978), pp. 64-70. http://geodesic.mathdoc.fr/item/MS2_1978__42_166576/