Stationary Precession Topological Solitons with Nonzero Hopf Invariant   in a Uniaxial Ferromagnet
  Three-dimensional stationary precession solitons with nonzero Hopf indices are found numerically by solving the Landau-Lifshitz equation. The structure and existence domain of the solitons are found. 
A. B. Borisov and F. N. Rybakov