@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/