We construct an uncountable set of strong automorphisms of the Witt ring of a global field.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-1-1, author = {Alfred Czoga\l a and Mieczys\l aw Kula}, title = {Automorphisms of Witt rings of global fields}, journal = {Acta Arithmetica}, volume = {166}, year = {2014}, pages = {1-13}, zbl = {1312.11025}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-1-1} }
Alfred Czogała; Mieczysław Kula. Automorphisms of Witt rings of global fields. Acta Arithmetica, Tome 166 (2014) pp. 1-13. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-1-1/