WDVV equations for 6d Seiberg-Witten theory and bi-elliptic curves
  We present a generic derivation of the WDVV equations for 6d Seiberg-Witten theory, and extend it to the families of bi-elliptic spectral curves. We find that the elliptization of the naive perturbative and nonperturbative 6d systems roughly "doubles" the number of moduli describing the system. 
H.W.Braden, A.Marshakov, A.Mironov and A.Morozov