Geodesic
Stability of solitons in $S^2$ in the nonlinear $\sigma$-model
Doklady Akademii Nauk, Tome 246 (1979) no. 4, pp. 840-842.

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     author = {A. F. Vakulenko and L. V. Kapitanski},
     title = {Stability of solitons in $S^2$ in the nonlinear $\sigma$-model},
     journal = {Doklady Akademii Nauk},
     pages = {840--842},
     publisher = {mathdoc},
     volume = {246},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_246_4_a19/}
}
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A. F. Vakulenko; L. V. Kapitanski. Stability of solitons in $S^2$ in the nonlinear $\sigma$-model. Doklady Akademii Nauk, Tome 246 (1979) no. 4, pp. 840-842. http://geodesic.mathdoc.fr/item/DAN_1979_246_4_a19/