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Dislocation in crystal (upper right); Equilibrium demagnetized magnetic domain structures (middle); Bubble domains in non-uniform materials (down). (N. Asakura: Fundamental Problems of Creating in the Two-Dimensional Space; M.P. Shaskol'skaya: Kristallografiya, Vysshaya shkola, Moskva, 1984; M. Pardavi-Horvath: Symmetry in Magnetizm, Symmetry: Culture and Science, 6, 1, 1995, 29-32) |