“…The initial value problem and initial-boundary value problems on semi-axes are considered, for example, in [2,3,4,6,7,14,15,16,17,21,22,23,26,27,32,34]. Also during last 30 years there were published several papers devoted to initial-boundary value problems (especially to the pure initial value problem) for the ZK equation and its extensions with more general nonlinearity (see, for example, bibliography in [11,12,13] and recent papers [5,20,25,29]). Wide classes of quasilinear dispersive equations were considered, for example, in [9,10,28].…”