@article{1102912801,
author = {Helton, Jon C.},
title = {Product integrals and inverses in normed rings.},
journal = {Pacific J. Math.},
volume = {55},
number = {2},
year = {1974},
pages = { 155-166},
language = {en},
url = {http://dml.mathdoc.fr/item/1102912801}
}
Helton, Jon C. Product integrals and inverses in normed rings.. Pacific J. Math., Tome 55 (1974) no. 2, pp. 155-166. http://gdmltest.u-ga.fr/item/1102912801/