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@article{CM_1980__41_1_3_0, author = {Goss, David}, title = {$\pi $-adic {Eisenstein} series for function fields}, journal = {Compositio Mathematica}, pages = {3--38}, publisher = {Sijthoff et Noordhoff International Publishers}, volume = {41}, number = {1}, year = {1980}, zbl = {0422.10020}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1980__41_1_3_0/} }
Goss, David. $\pi $-adic Eisenstein series for function fields. Compositio Mathematica, Tome 41 (1980) no. 1, pp. 3-38. http://geodesic.mathdoc.fr/item/CM_1980__41_1_3_0/