Geodesic
Structure of topological solitons in the Skyrme model
Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 3, pp. 353-360

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The types of invariant configurations admitted by the field equations in four-dimensional $SU(2)$ chiral models are studied. It is shown that in the Skyrme model in the second and higher homotopy classes the fields that realize an absolute minimum of the energy are axisymmetric, while those in the first class are spherically symmetric. 
@article{TMF_1988_75_3_a2,
     author = {I. R. Kozhevnikov and Yu. P. Rybakov and M. B. Fomin},
     title = {Structure of topological solitons in the {Skyrme} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {353--360},
     publisher = {mathdoc},
     volume = {75},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_3_a2/}
}
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I. R. Kozhevnikov; Yu. P. Rybakov; M. B. Fomin. Structure of topological solitons in the Skyrme model. Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 3, pp. 353-360. http://geodesic.mathdoc.fr/item/TMF_1988_75_3_a2/