%0 Journal Article
%A A. M. Nakhushev
%T On the positivity of continuous and discrete differentiation and integration operators that are very important in fractional calculus and in the theory of equations of mixed type
%J Differencialʹnye uravneniâ
%D 1998
%P 101-109
%V 34
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_1_a15/
%G ru
%F DE_1998_34_1_a15