%0 Journal Article %A L. D. Kudryavtsev %T Traces of functions of several variables, and direction fields that are regular at infinity for the Laplace operator %J Informatics and Automation %D 1971 %P 256-270 %V 112 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a16/ %G ru %F TRSPY_1971_112_a16