Quasi-periodic wave solutions for the (2+1) -dimensional generalized Calogero–Bogoyavlenskii–Schiff (CBS) equation

The Hirota bilinear method is implemented to directly construct quasi-periodic wave solutions in terms of theta functions for a Hirota bilinear equation. The result is applied to the (2+1)-dimensional generalized Calogero–Bogoyavlenskii–Schiff (CBS) equation, thereby yielding their quasi-periodic wave solutions under the Backlund transformation u=ηy+3δ[lnf(x,y,t)]x.