@article{AM2_1981__22_136873,
     author = {Robert P. Infante},
     title = {On the {Galois} theory of difference fields.},
     journal = {Aequationes mathematicae},
     pages = {194--207},
     publisher = {mathdoc},
     volume = {22},
     year = {1981},
     zbl = {0483.12005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1981__22_136873/}
}