Geodesic
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
Differencialʹnye uravneniâ, Tome 6 (1970) no. 7, pp. 1308-1310.

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     author = {N. Z. Gabbasov and E. S. Chichkin},
     title = {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},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1308--1310},
     publisher = {mathdoc},
     volume = {6},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a19/}
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N. Z. Gabbasov; E. S. Chichkin. 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. Differencialʹnye uravneniâ, Tome 6 (1970) no. 7, pp. 1308-1310. http://geodesic.mathdoc.fr/item/DE_1970_6_7_a19/