1. A. M. Kosevich, B. A. Ivanov, and A. S. Kovalev, Nonlinear Waves of Magnetization. Dynamical and Topological Solitons (Naukova Dumka, Kiev, 1983) [in Russian].
2. A. B. Borisov and V. V. Kiselev, Nonlinear Waves, Solitons, and Localized Structures in Magnets. Vol. I. Quasi-One-Dimensioned Magnetic Solitons (Ural. Otd. Ross. Akad. Nauk, Ekaterinburg, 2009) [in Russian].
3. A. B. Borisov and V. V. Kiselev, Nonlinear Waves, Solitons, and Localized Structures in Magnets. Vol. II. Topological Solitons, Two-Dimensional and Three-Dimensional “Patterns” (Ural. Otd. Ross. Akad. Nauk, Ekaterinburg, 2011) [in Russian].
4. S. E. Gouvea, G. S. Wysin, F. G. Mertens, and A. R. Bishop, “Vortices in the classical two-dimensional Heisenberg model,” Phys. Rev. B: Condens. Matter 39, 11840–11849 (1989).
5. B. A. Ivanov and A. K. Kolezhuk, “Solitons in low-dimensional antiferromagnets (review),” Fiz. Nizk. Temp. 21, 355–389 (1995).