  Any Neumann quasigroup $(Q, \cdot)$ (quasigroup with Neumann identity $ x
\cdot(yz \cdot yx) = z$ is called Neumann quasigroup) can be presented in the
form $x\cdot y = x-y$, where $(Q, +)$ is an abelian group. Automorphism group
of Neumann quasigroup coincides with the group $Aut(Q, +)$. Any Schweizer
quasigroup (quasigroup with Schweizer identity $xy \cdot xz = zy$ is called
Schweizer quasigroup) is a Neumann quasigroup and vice versa. Any Neumann
quasigroup is a GA-quasigroup.
