A transfer morphism for Witt cogroups

Let $A$ be a ring with an involution in which 2 is invertible, $\epsilon$ be 1 or $-1$, $s(\in A)$ be a central regular element such that $s^\ast = s$. We construct a transfer homomorphism $_\epsilon W'_0(A/s)\to{}_\epsilon W'_1(A)$ for Witt cogroups and prove a projection formula. Bibl. – 11 titles.