Topological and dynamical excitations in a classical 2D easy-axis Heisenberg modelT. Kamppeter, S. A. Leonel, F. G. Mertens, M. E. Gouvêa, A. S.T. Pires and A. S. KovalevEur. Phys. J. B, 21 1 (2001) 93-102DOI: https://doi.org/10.1007/PL00011118