%0 Journal Article
%A O. N. Vasilenko
%T On a relationship between approximation of exponentials and approximation of $\psi$-functions
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1991
%P 57-58
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1991_3_a11/
%G ru
%F VMUMM_1991_3_a11