%0 Journal Article %A E. S. Dzektser %T Equation of motion of underground water with a free surface in multilayer media %J Doklady Akademii Nauk %D 1975 %P 540-543 %V 220 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1975_220_3_a9/ %G ru %F DAN_1975_220_3_a9