Exact solutions of an elliptic Calogero--Sutherland model
  A model describing N particles on a line interacting pairwise via an elliptic function potential in the presence of an external field is partially solved in the quantum case in a totally algebraic way. As an example, the ground state and the lowest excitations are calculated explicitly for N=2. 
D. Gomez-Ullate, A. Gonzalez-Lopez, M. A. Rodriguez