%0 Journal Article %A B. I. Birger %A A. T. Ismail-zade %A B. M. Naimark %T Thermoconvective stability of the Earth in presence of chemical boundary between the upper mantle and the lower mantle %J Doklady Akademii Nauk %D 1990 %P 57-61 %V 315 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a12/ %G ru %F DAN_1990_315_1_a12