@article{GMJ_1999__6_2_48315,
     author = {Pkhakadze, Sh.},
     title = {A {N.} {Bourbaki} type general theory and the properties of contracting symbols and corresponding contracted forms.},
     journal = {Georgian Mathematical Journal},
     pages = {179--190},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1999},
     zbl = {0929.03017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1999__6_2_48315/}
}