Szukana fraza: [Abstract = "In this paper, a survey of recent results concerning controllability of 2\-D systems is presented. Various types of linear and nonlinear 2\-D systems with constant coefficients are discussed. Several controllability conditions for various kinds of 2\-D systems are formulated without proofs. Moreover, many supplementary remarks and bibliographical comments are given. The relationships between different concepts of controllability are also explained."]