TY  - JOUR
AU  - I. V. Abarenkov
TI  - Perturbation theory for the ground singlet state of the Heisenberg spin~1/2 antiferromagnetic chain
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1995
SP  - 14
EP  - 35
VL  - 224
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1995_224_a2/
LA  - ru
ID  - ZNSL_1995_224_a2
ER  -