%0 Journal Article
%A I. V. Abarenkov
%T Perturbation theory for the ground singlet state of the Heisenberg spin~1/2 antiferromagnetic chain
%J Zapiski Nauchnykh Seminarov POMI
%D 1995
%P 14-35
%V 224
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1995_224_a2/
%G ru
%F ZNSL_1995_224_a2