@article{1103898910,
author = {B\'ellissard, J.},
title = {Quantized fields in interaction with external fields. I. Exact solutions and perturbative expansions},
journal = {Comm. Math. Phys.},
volume = {40},
number = {1},
year = {1975},
pages = { 235-266},
language = {en},
url = {http://dml.mathdoc.fr/item/1103898910}
}
Béllissard, J. Quantized fields in interaction with external fields. I. Exact solutions and perturbative expansions. Comm. Math. Phys., Tome 40 (1975) no. 1, pp. 235-266. http://gdmltest.u-ga.fr/item/1103898910/