1. Partially Dual Variables in SU(2) Yang-Mills Theory
2. Partial duality in SU(N) Yang-Mills theory
3. Stable knot-like structures in classical field theory
4. R. Battye, P. Sutcliffe, hep-th/9811077; J. Hietarinta, P. Salo, Phys. Lett. B 451 (1999) 60.
5. See e.g., V. Periwal, hep-th/9808127; S.V. Shabanov, hep-th/9903223; K.I. Kondo, Y. Taira, hep-th/9906129; Y.M. Cho, hep-th/9906198.