%0 Journal Article
%A Henning, H.B.
%T Series approximations to powers of $\pi $
%J Portugaliae mathematica
%D 1973
%P 171-177
%V 32
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1973__32_3_115205/
%G en
%F PORMA_1973__32_3_115205