Almost periodic solutions of a (2+1)-dimensional Schwarzian Korteweg de Vries equation

We consider the evolution of the (2+1)-dimensional Schwarzian Korteweg de Vries equation {8ϖ2ϖτ+2ϖ2ϖζζη−8ϖϖζϖζη−2ϖϖζζϖη+4ϖζ2ϖη−ϖϖζϖ̃η=0,ϖ2ϖ̃ζ=ϖζ2, with ϖ⁄=0 in C, while the independent variable τ (“time”) is complex. We prove that there exist many almost periodic solutions.