Generating Quadrilateral and Circular Lattices in KP Theory
  The bilinear equations of the $N$-component KP and BKP hierarchies and a corresponding extended Miwa transformation allow us to generate quadrilateral and circular lattices from conjugate and orthogonal nets, respectively. The main geometrical objects are expressed in terms of Baker functions. 
Adam Doliwa, Manuel Manas and Luis Martinez Alonso