%0 Journal Article %A N. Z. Gabbasov %A E. S. Chichkin %T The estimation of the domains of nonnegativity of the Cauchy function and its derivatives up to order $n-1$ for an $n$th order ordinary linear differential equation %J Differencialʹnye uravneniâ %D 1970 %P 1308-1310 %V 6 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1970_6_7_a19/ %G ru %F DE_1970_6_7_a19