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@article{MZ_1991__206_1_174227, author = {Robert W. Fitzgerald}, title = {Picard groups of {Witt} rings.}, journal = {Mathematische Zeitschrift}, pages = {303--320}, publisher = {mathdoc}, volume = {206}, number = {1}, year = {1991}, zbl = {0702.11024}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174227/} }
Robert W. Fitzgerald. Picard groups of Witt rings.. Mathematische Zeitschrift, Tome 206 (1991) no. 1, pp. 303-320. http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174227/