%0 Journal Article %A V. V. Solov'ev %T Inverse problems for elliptic equations on the plane: I %J Differencialʹnye uravneniâ %D 2006 %P 1106-1114 %V 42 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2006_42_8_a10/ %G ru %F DE_2006_42_8_a10