Mixed Witt rings of algebras with involution, Canadian Journal of Mathematics. Link.
Disclaimer: the pdf in the direct links (not arXiv links) are subject to regular changes, might have references and bibliography issues and should not be referred to.
An Artin-Schreier-type theory for signatures of hermitian forms over involutions of the first kind. Link.
Lambda-operations for hermitian forms over algebras with involution of the first kind. Link.
Mixed Witt rings of algebras with involution of the first kind, longer arxiv preprint to be divided in 4 or 5 articles (yes, the title confusion with the accepted article is not ideal, but arXiv does not allow title changes). arXiv link
PhD dissertation (in French): Invariants cohomologiques de groupes algébriques et d'algèbres à involution (under the supervision of Anne Quéguiner). Link.