%0 Journal Article
%T Affine invariants of annuli
%A Waldemar Cie lak
%A El bieta Szczygielska
%J Annales UMCS, Mathematica
%D 2012
%I 
%R 10.2478/v10062-012-0002-4
%X A family of regular annuli is considered. Affine invariants of annuli are introduced.
%K Invariant
%K annulus
%U http://versita.metapress.com/content/g80315jp19606p35/?p=64a4d699d9b446d3b7d73b3d71d001e5&pi=1