Exact Solution of an Electronic Model of Superconductivity in 1+1   Dimensions
  We study a superconducting integrable model of strongly correlated electrons in 1+1 dimensions. We construct all six Bethe Ans\"atze for the model and give explicit expressions for lowest conservation laws. We also prove a lowest weight theorem for the Bethe-Ansatz states. 
Fabian H.L. Essler, Vladimir E. Korepin, Kareljan Schoutens