@article{1077492793,
author = {Flexner, William W.},
title = {Non-commutative chains and the Poincar\'e group},
journal = {Duke Math. J.},
volume = {8},
number = {1},
year = {1941},
pages = { 497-505},
language = {en},
url = {http://dml.mathdoc.fr/item/1077492793}
}
Flexner, William W. Non-commutative chains and the Poincaré group. Duke Math. J., Tome 8 (1941) no. 1, pp. 497-505. http://gdmltest.u-ga.fr/item/1077492793/