@article{1103859593,
author = {Graffi, S. and Grecchi, V.},
title = {Matrix moment methods in perturbation theory, boson quantum field models, and anharmonic oscillators},
journal = {Comm. Math. Phys.},
volume = {35},
number = {1},
year = {1974},
pages = { 235-252},
language = {en},
url = {http://dml.mathdoc.fr/item/1103859593}
}
Graffi, S.; Grecchi, V. Matrix moment methods in perturbation theory, boson quantum field models, and anharmonic oscillators. Comm. Math. Phys., Tome 35 (1974) no. 1, pp. 235-252. http://gdmltest.u-ga.fr/item/1103859593/