@article{01310564, title = {A N. Bourbaki type general theory and the properties of contracting symbols and corresponding contracted forms.}, journal = {Georgian Mathematical Journal}, volume = {6}, year = {1999}, pages = {179-190}, doi = {10.1023/A:1022128817224}, zbl = {0929.03017}, language = {en}, url = {http://dml.mathdoc.fr/item/01310564} }
Pkhakadze, Sh. A N. Bourbaki type general theory and the properties of contracting symbols and corresponding contracted forms.. Georgian Mathematical Journal, Tome 6 (1999) pp. 179-190. doi : 10.1023/A:1022128817224. http://gdmltest.u-ga.fr/item/01310564/