%0 Journal Article
%A R. P. Tarasov
%T A quadratic root of a selfadjoint operator, and the Cauchy problem for elliptic-type equations
%J Differencialʹnye uravneniâ
%D 1993
%P 662-672
%V 29
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_4_a10/
%G ru
%F DE_1993_29_4_a10