%0 Journal Article
%A Mencherini, Lorenzo
%T A simple necessary and sufficient condition for well-posedness of $2 \times 2$ differential systems with time-dependent coefficients
%J Bollettino della Unione matematica italiana
%D 2006
%P 215-220
%V 9B
%N 1
%I mathdoc
%U https://geodesic-test.mathdoc.fr/item/BUMI_2006_8_9B_1_a10/
%G it
%F BUMI_2006_8_9B_1_a10