Scattering of vortex pairs in 2D easy-plane ferromagnets A. S. Kovalev, S. Komineas and F. G. Mertens Eur. Phys. J. B, 25 1 (2002) 89-100 Published online: 15 January 2002 DOI: 10.1140/e10051-002-0010-1