%0 Journal Article %A Anatoliy P. Petravchuk %A Oleksandr G. Iena %T On closed rational functions in several variables %J Algebra and discrete mathematics %D 2007 %P 115-124 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ADM_2007_2_a10/ %G en %F ADM_2007_2_a10