%0 Journal Article %A Yu. A. Izrael %T On the selection of principal factors for the calculation of geophysical and ecological %J Doklady Akademii Nauk %D 1985 %P 821-825 %V 281 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1985_281_4_a11/ %G ru %F DAN_1985_281_4_a11