Difference Krichever-Novikov operators
  In this paper we study commuting difference operators of rank two. We introduce an equation on potentials $V(n),W(n)$ of the difference operator $L_4=(T+V(n)T^{-1})^2+W(n)$ and some additional data. With the help of this equation we find the first examples of commuting difference operators of rank two corresponding to spectral curves of higher genus. 
Gulnara S. Mauleshova and Andrey E. Mironov
nlin.SI