%0 Journal Article
%A Bachir, A.
%A Segres, A.
%T On the  class operators.
%J International journal of open problems in computer science and mathematics
%D 2009
%P 48
%V 2
%N 1
%U http://geodesic.mathdoc.fr/item/IJOPCM_2009__2_1_225649/
%G en
%F IJOPCM_2009__2_1_225649