%0 Journal Article %A V. A. Ivanov %A V. D. Chugunov %T Application of a qualitative theory of functional equations to the study of inhomogeneous petroleum beds and the determination of pressures and outputs of wells %J Doklady Akademii Nauk %D 1975 %P 52-55 %V 221 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1975_221_1_a12/ %G ru %F DAN_1975_221_1_a12