@article{GDZPPN002338866,
title = {A positivity result and normalization of positive convolution structures.},
journal = {Mathematische Annalen},
volume = {295},
year = {1993},
pages = {677-692},
zbl = {0856.43004},
url = {http://dml.mathdoc.fr/item/GDZPPN002338866}
}
Voit, Michael. A positivity result and normalization of positive convolution structures.. Mathematische Annalen, Tome 295 (1993) pp. 677-692. http://gdmltest.u-ga.fr/item/GDZPPN002338866/