On the Ground State Energy of the Delta-Function Fermi Gas II: Further   Asymptotics
  Building on previous work of the authors, we here derive the weak coupling asymptotics to order $\gamma^2$ of the ground state energy of the delta-function Fermi gas. We use a method that can be applied to a large class of finite convolution operators. 
Craig A. Tracy, Harold Widom
math-ph math.MP