%0 Book
%A Trjitzinsky, W. J.
%T Analytic theory of non-linear singular differential equations
%S Mémorial des sciences mathématiques
%D 1938
%N 90
%I Gauthier-Villars
%U http://www.numdam.org/item/MSM_1938__90__1_0/
%G en
%F MSM_1938__90__1_0