@article{1103921701,
author = {Baumann, Klaus},
title = {All massless, scalar fields with trivial $S$-matrix are Wick-polynomials},
journal = {Comm. Math. Phys.},
volume = {83},
number = {1},
year = {1982},
pages = { 247-256},
language = {en},
url = {http://dml.mathdoc.fr/item/1103921701}
}
Baumann, Klaus. All massless, scalar fields with trivial $S$-matrix are Wick-polynomials. Comm. Math. Phys., Tome 83 (1982) no. 1, pp. 247-256. http://gdmltest.u-ga.fr/item/1103921701/