Hermite-Halphen-Bloch solution of two-gap Lam\'e equation
  We construct the Hermite--Halphen--Bloch solution for the two-gap ($n=2$) Lam\'e equation of Jacobian form and give closed formulae to calculate the energy band dispersion relation. 
Jun-ichiro Kishine and A. S. Ovchinnikov
math-ph cond-mat.stat-mech hep-th math.MP nlin.SI