Geodesic
Gell--Mann--Low function of the chiral model on the homogeneous berger space
Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 155-160

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For the two-dimensional nonlinear sigma model on the homogeneous space $Sp(2)/SU(2)$ (Berger manifold) the method of sectional curvatures is used to find the Gell–Mann–Low $\beta$ function in the single-loop approximation. The result indicates that the model is an asymptotically free renormalizable nonlinear model. 
@article{TMF_1985_65_1_a14,
     author = {A. M. Gavrilik},
     title = {Gell--Mann--Low function of the chiral model on the homogeneous berger space},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {155--160},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_65_1_a14/}
}
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A. M. Gavrilik. Gell--Mann--Low function of the chiral model on the homogeneous berger space. Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 155-160. http://geodesic.mathdoc.fr/item/TMF_1985_65_1_a14/