A perturbative approach to the quantum elliptic Calogero-Sutherland   model
  We solve perturbatively the quantum elliptic Calogero-Sutherland model in the regime in which the quotient between the real and imaginary semiperiods of the Weierstrass ${\cal P}$ function is small 
Jose Fernandez Nunez, Wifredo Garcia Fuertes, Askold Perelomov (Univ.   de Oviedo)