“…The theory of solubility and well-posedness for ZK equation and its generalizations is most developed for the pure initial-value problem. For the considered two-dimensional case the corresponding results in different functional spaces can be found in [32,6,7,2,26,27,31,15,3,18,30,16,17]. For initial-boundary value problems the theory is most developed for domains of a type I × R , where I is an interval (bounded or unbounded) on the variable x , that is, the variable y varies in the whole line ( [8,9,11,10,33,12,5]).…”