Non-Linear Evolution Equations with Non-Analytic Dispersion Relations in   2+1 Dimensions. Bilocal Approach
  A method is proposed of obtaining (2+1)-dimensional non- linear equations with non-analytic dispersion relations. Bilocal formalism is shown to make it possible to represent these equations in a form close to that for their counterparts in 1+1 dimensions. 
Evgeny V.Doktorov (Institute of Physics, 220072 Minsk, Belarus)