@article{1102905517,
author = {Wollenberg, Manfred},
title = {The invariance principle for wave operators.},
journal = {Pacific J. Math.},
volume = {61},
number = {2},
year = {1975},
pages = { 303-315},
language = {en},
url = {http://dml.mathdoc.fr/item/1102905517}
}
Wollenberg, Manfred. The invariance principle for wave operators.. Pacific J. Math., Tome 61 (1975) no. 2, pp. 303-315. http://gdmltest.u-ga.fr/item/1102905517/