%0 Journal Article
%A I. M. Gel'fand
%A V. V. Serganova
%T On the general definition of a matroid and a greedoid
%J Doklady Akademii Nauk
%D 1987
%P 15-20
%V 292
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_292_1_a1/
%G ru
%F DAN_1987_292_1_a1