Hirota bilinear forms with 2-toroidal symmetry
  In this note, we compute Hirota bilinear forms arising from both homogeneous and principal realization of vertex representations of 2-toroidal Lie algebras of type $A_l, D_l, E_l$. 
K. Iohara (Kyoto Univ.), Y. Saito (Hiroshima Univ.), M. Wakimoto   (Kyushu Univ.)